Identifier
-
Mp00031:
Dyck paths
—to 312-avoiding permutation⟶
Permutations
Mp00073: Permutations —major-index to inversion-number bijection⟶ Permutations
Mp00170: Permutations —to signed permutation⟶ Signed permutations
St001907: Signed permutations ⟶ ℤ
Values
[1,0] => [1] => [1] => [1] => 0
[1,0,1,0] => [1,2] => [1,2] => [1,2] => 0
[1,1,0,0] => [2,1] => [2,1] => [2,1] => 1
[1,0,1,0,1,0] => [1,2,3] => [1,2,3] => [1,2,3] => 0
[1,0,1,1,0,0] => [1,3,2] => [2,3,1] => [2,3,1] => 2
[1,1,0,0,1,0] => [2,1,3] => [2,1,3] => [2,1,3] => 1
[1,1,0,1,0,0] => [2,3,1] => [3,1,2] => [3,1,2] => 1
[1,1,1,0,0,0] => [3,2,1] => [3,2,1] => [3,2,1] => 1
[1,0,1,0,1,0,1,0] => [1,2,3,4] => [1,2,3,4] => [1,2,3,4] => 0
[1,0,1,0,1,1,0,0] => [1,2,4,3] => [2,3,4,1] => [2,3,4,1] => 3
[1,0,1,1,0,0,1,0] => [1,3,2,4] => [2,3,1,4] => [2,3,1,4] => 2
[1,0,1,1,0,1,0,0] => [1,3,4,2] => [2,4,1,3] => [2,4,1,3] => 2
[1,0,1,1,1,0,0,0] => [1,4,3,2] => [3,4,2,1] => [3,4,2,1] => 2
[1,1,0,0,1,0,1,0] => [2,1,3,4] => [2,1,3,4] => [2,1,3,4] => 1
[1,1,0,0,1,1,0,0] => [2,1,4,3] => [3,2,4,1] => [3,2,4,1] => 2
[1,1,0,1,0,0,1,0] => [2,3,1,4] => [3,1,2,4] => [3,1,2,4] => 1
[1,1,0,1,0,1,0,0] => [2,3,4,1] => [4,1,2,3] => [4,1,2,3] => 1
[1,1,0,1,1,0,0,0] => [2,4,3,1] => [4,2,3,1] => [4,2,3,1] => 1
[1,1,1,0,0,0,1,0] => [3,2,1,4] => [3,2,1,4] => [3,2,1,4] => 1
[1,1,1,0,0,1,0,0] => [3,2,4,1] => [4,2,1,3] => [4,2,1,3] => 1
[1,1,1,0,1,0,0,0] => [3,4,2,1] => [4,3,1,2] => [4,3,1,2] => 2
[1,1,1,1,0,0,0,0] => [4,3,2,1] => [4,3,2,1] => [4,3,2,1] => 2
[1,0,1,0,1,0,1,0,1,0] => [1,2,3,4,5] => [1,2,3,4,5] => [1,2,3,4,5] => 0
[1,0,1,0,1,0,1,1,0,0] => [1,2,3,5,4] => [2,3,4,5,1] => [2,3,4,5,1] => 4
[1,0,1,0,1,1,0,0,1,0] => [1,2,4,3,5] => [2,3,4,1,5] => [2,3,4,1,5] => 3
[1,0,1,0,1,1,0,1,0,0] => [1,2,4,5,3] => [2,3,5,1,4] => [2,3,5,1,4] => 3
[1,0,1,0,1,1,1,0,0,0] => [1,2,5,4,3] => [3,4,5,2,1] => [3,4,5,2,1] => 3
[1,0,1,1,0,0,1,0,1,0] => [1,3,2,4,5] => [2,3,1,4,5] => [2,3,1,4,5] => 2
[1,0,1,1,0,0,1,1,0,0] => [1,3,2,5,4] => [3,4,2,5,1] => [3,4,2,5,1] => 3
[1,0,1,1,0,1,0,0,1,0] => [1,3,4,2,5] => [2,4,1,3,5] => [2,4,1,3,5] => 2
[1,0,1,1,0,1,0,1,0,0] => [1,3,4,5,2] => [2,5,1,3,4] => [2,5,1,3,4] => 2
[1,0,1,1,0,1,1,0,0,0] => [1,3,5,4,2] => [3,5,2,4,1] => [3,5,2,4,1] => 2
[1,0,1,1,1,0,0,0,1,0] => [1,4,3,2,5] => [3,4,2,1,5] => [3,4,2,1,5] => 2
[1,0,1,1,1,0,0,1,0,0] => [1,4,3,5,2] => [3,5,2,1,4] => [3,5,2,1,4] => 2
[1,0,1,1,1,0,1,0,0,0] => [1,4,5,3,2] => [3,5,4,1,2] => [3,5,4,1,2] => 3
[1,0,1,1,1,1,0,0,0,0] => [1,5,4,3,2] => [4,5,3,2,1] => [4,5,3,2,1] => 2
[1,1,0,0,1,0,1,0,1,0] => [2,1,3,4,5] => [2,1,3,4,5] => [2,1,3,4,5] => 1
[1,1,0,0,1,0,1,1,0,0] => [2,1,3,5,4] => [3,2,4,5,1] => [3,2,4,5,1] => 3
[1,1,0,0,1,1,0,0,1,0] => [2,1,4,3,5] => [3,2,4,1,5] => [3,2,4,1,5] => 2
[1,1,0,0,1,1,0,1,0,0] => [2,1,4,5,3] => [3,2,5,1,4] => [3,2,5,1,4] => 2
[1,1,0,0,1,1,1,0,0,0] => [2,1,5,4,3] => [4,3,5,2,1] => [4,3,5,2,1] => 3
[1,1,0,1,0,0,1,0,1,0] => [2,3,1,4,5] => [3,1,2,4,5] => [3,1,2,4,5] => 1
[1,1,0,1,0,0,1,1,0,0] => [2,3,1,5,4] => [4,2,3,5,1] => [4,2,3,5,1] => 2
[1,1,0,1,0,1,0,0,1,0] => [2,3,4,1,5] => [4,1,2,3,5] => [4,1,2,3,5] => 1
[1,1,0,1,0,1,0,1,0,0] => [2,3,4,5,1] => [5,1,2,3,4] => [5,1,2,3,4] => 1
[1,1,0,1,0,1,1,0,0,0] => [2,3,5,4,1] => [5,2,3,4,1] => [5,2,3,4,1] => 1
[1,1,0,1,1,0,0,0,1,0] => [2,4,3,1,5] => [4,2,3,1,5] => [4,2,3,1,5] => 1
[1,1,0,1,1,0,0,1,0,0] => [2,4,3,5,1] => [5,2,3,1,4] => [5,2,3,1,4] => 1
[1,1,0,1,1,0,1,0,0,0] => [2,4,5,3,1] => [5,2,4,1,3] => [5,2,4,1,3] => 2
[1,1,0,1,1,1,0,0,0,0] => [2,5,4,3,1] => [5,3,4,2,1] => [5,3,4,2,1] => 3
[1,1,1,0,0,0,1,0,1,0] => [3,2,1,4,5] => [3,2,1,4,5] => [3,2,1,4,5] => 1
[1,1,1,0,0,0,1,1,0,0] => [3,2,1,5,4] => [4,3,2,5,1] => [4,3,2,5,1] => 3
[1,1,1,0,0,1,0,0,1,0] => [3,2,4,1,5] => [4,2,1,3,5] => [4,2,1,3,5] => 1
[1,1,1,0,0,1,0,1,0,0] => [3,2,4,5,1] => [5,2,1,3,4] => [5,2,1,3,4] => 1
[1,1,1,0,0,1,1,0,0,0] => [3,2,5,4,1] => [5,3,2,4,1] => [5,3,2,4,1] => 2
[1,1,1,0,1,0,0,0,1,0] => [3,4,2,1,5] => [4,3,1,2,5] => [4,3,1,2,5] => 2
[1,1,1,0,1,0,0,1,0,0] => [3,4,2,5,1] => [5,3,1,2,4] => [5,3,1,2,4] => 2
[1,1,1,0,1,0,1,0,0,0] => [3,4,5,2,1] => [5,4,1,2,3] => [5,4,1,2,3] => 2
[1,1,1,0,1,1,0,0,0,0] => [3,5,4,2,1] => [5,4,2,3,1] => [5,4,2,3,1] => 2
[1,1,1,1,0,0,0,0,1,0] => [4,3,2,1,5] => [4,3,2,1,5] => [4,3,2,1,5] => 2
[1,1,1,1,0,0,0,1,0,0] => [4,3,2,5,1] => [5,3,2,1,4] => [5,3,2,1,4] => 2
[1,1,1,1,0,0,1,0,0,0] => [4,3,5,2,1] => [5,4,2,1,3] => [5,4,2,1,3] => 2
[1,1,1,1,0,1,0,0,0,0] => [4,5,3,2,1] => [5,4,3,1,2] => [5,4,3,1,2] => 2
[1,1,1,1,1,0,0,0,0,0] => [5,4,3,2,1] => [5,4,3,2,1] => [5,4,3,2,1] => 2
[1,0,1,0,1,0,1,0,1,0,1,0] => [1,2,3,4,5,6] => [1,2,3,4,5,6] => [1,2,3,4,5,6] => 0
[1,0,1,0,1,0,1,0,1,1,0,0] => [1,2,3,4,6,5] => [2,3,4,5,6,1] => [2,3,4,5,6,1] => 5
[1,0,1,0,1,0,1,1,0,0,1,0] => [1,2,3,5,4,6] => [2,3,4,5,1,6] => [2,3,4,5,1,6] => 4
[1,0,1,0,1,0,1,1,0,1,0,0] => [1,2,3,5,6,4] => [2,3,4,6,1,5] => [2,3,4,6,1,5] => 4
[1,0,1,0,1,0,1,1,1,0,0,0] => [1,2,3,6,5,4] => [3,4,5,6,2,1] => [3,4,5,6,2,1] => 4
[1,0,1,0,1,1,0,0,1,0,1,0] => [1,2,4,3,5,6] => [2,3,4,1,5,6] => [2,3,4,1,5,6] => 3
[1,0,1,0,1,1,0,0,1,1,0,0] => [1,2,4,3,6,5] => [3,4,5,2,6,1] => [3,4,5,2,6,1] => 4
[1,0,1,0,1,1,0,1,0,0,1,0] => [1,2,4,5,3,6] => [2,3,5,1,4,6] => [2,3,5,1,4,6] => 3
[1,0,1,0,1,1,0,1,0,1,0,0] => [1,2,4,5,6,3] => [2,3,6,1,4,5] => [2,3,6,1,4,5] => 3
[1,0,1,0,1,1,1,0,0,0,1,0] => [1,2,5,4,3,6] => [3,4,5,2,1,6] => [3,4,5,2,1,6] => 3
[1,0,1,0,1,1,1,1,0,0,0,0] => [1,2,6,5,4,3] => [4,5,6,3,2,1] => [4,5,6,3,2,1] => 3
[1,0,1,1,0,0,1,0,1,0,1,0] => [1,3,2,4,5,6] => [2,3,1,4,5,6] => [2,3,1,4,5,6] => 2
[1,0,1,1,0,0,1,0,1,1,0,0] => [1,3,2,4,6,5] => [3,4,2,5,6,1] => [3,4,2,5,6,1] => 4
[1,0,1,1,0,0,1,1,0,0,1,0] => [1,3,2,5,4,6] => [3,4,2,5,1,6] => [3,4,2,5,1,6] => 3
[1,0,1,1,0,0,1,1,1,0,0,0] => [1,3,2,6,5,4] => [4,5,3,6,2,1] => [4,5,3,6,2,1] => 3
[1,0,1,1,0,1,0,0,1,0,1,0] => [1,3,4,2,5,6] => [2,4,1,3,5,6] => [2,4,1,3,5,6] => 2
[1,0,1,1,0,1,0,1,0,0,1,0] => [1,3,4,5,2,6] => [2,5,1,3,4,6] => [2,5,1,3,4,6] => 2
[1,0,1,1,0,1,0,1,0,1,0,0] => [1,3,4,5,6,2] => [2,6,1,3,4,5] => [2,6,1,3,4,5] => 2
[1,0,1,1,0,1,1,0,1,0,0,0] => [1,3,5,6,4,2] => [3,6,2,5,1,4] => [3,6,2,5,1,4] => 3
[1,0,1,1,1,0,0,0,1,0,1,0] => [1,4,3,2,5,6] => [3,4,2,1,5,6] => [3,4,2,1,5,6] => 2
[1,0,1,1,1,0,0,0,1,1,0,0] => [1,4,3,2,6,5] => [4,5,3,2,6,1] => [4,5,3,2,6,1] => 3
[1,0,1,1,1,1,0,0,0,0,1,0] => [1,5,4,3,2,6] => [4,5,3,2,1,6] => [4,5,3,2,1,6] => 2
[1,0,1,1,1,1,1,0,0,0,0,0] => [1,6,5,4,3,2] => [5,6,4,3,2,1] => [5,6,4,3,2,1] => 3
[1,1,0,0,1,0,1,0,1,0,1,0] => [2,1,3,4,5,6] => [2,1,3,4,5,6] => [2,1,3,4,5,6] => 1
[1,1,0,0,1,0,1,0,1,1,0,0] => [2,1,3,4,6,5] => [3,2,4,5,6,1] => [3,2,4,5,6,1] => 4
[1,1,0,0,1,0,1,1,0,0,1,0] => [2,1,3,5,4,6] => [3,2,4,5,1,6] => [3,2,4,5,1,6] => 3
[1,1,0,0,1,0,1,1,1,0,0,0] => [2,1,3,6,5,4] => [4,3,5,6,2,1] => [4,3,5,6,2,1] => 4
[1,1,0,0,1,1,0,0,1,0,1,0] => [2,1,4,3,5,6] => [3,2,4,1,5,6] => [3,2,4,1,5,6] => 2
[1,1,0,0,1,1,0,0,1,1,0,0] => [2,1,4,3,6,5] => [4,3,5,2,6,1] => [4,3,5,2,6,1] => 4
[1,1,0,0,1,1,0,1,0,0,1,0] => [2,1,4,5,3,6] => [3,2,5,1,4,6] => [3,2,5,1,4,6] => 2
[1,1,0,0,1,1,0,1,0,1,0,0] => [2,1,4,5,6,3] => [3,2,6,1,4,5] => [3,2,6,1,4,5] => 2
[1,1,0,0,1,1,1,0,0,0,1,0] => [2,1,5,4,3,6] => [4,3,5,2,1,6] => [4,3,5,2,1,6] => 3
[1,1,0,0,1,1,1,1,0,0,0,0] => [2,1,6,5,4,3] => [5,4,6,3,2,1] => [5,4,6,3,2,1] => 3
[1,1,0,1,0,0,1,0,1,0,1,0] => [2,3,1,4,5,6] => [3,1,2,4,5,6] => [3,1,2,4,5,6] => 1
[1,1,0,1,0,0,1,0,1,1,0,0] => [2,3,1,4,6,5] => [4,2,3,5,6,1] => [4,2,3,5,6,1] => 3
[1,1,0,1,0,0,1,1,0,0,1,0] => [2,3,1,5,4,6] => [4,2,3,5,1,6] => [4,2,3,5,1,6] => 2
[1,1,0,1,0,0,1,1,1,0,0,0] => [2,3,1,6,5,4] => [5,3,4,6,2,1] => [5,3,4,6,2,1] => 4
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Description
The number of Bastidas - Hohlweg - Saliola excedances of a signed permutation.
For a signed permutation $\sigma$, this equals
$$ \left\lfloor \dfrac{fexc(\sigma)+1}{2} \right\rfloor = exc(\sigma) + \left\lfloor \dfrac{neg(\sigma)+1}{2} \right\rfloor, $$
where
$$fexc(\sigma) = 2exc(\sigma) + neg(\sigma),$$
$$exc(\sigma) = |\{i \in [n-1] \,:\, \sigma(i) > i\}|,$$
$$neg(\sigma) = |\{i \in [n] \,:\, \sigma(i) < 0\}|.$$
This statistic has the same distribution as the descent statistic St001427The number of descents of a signed permutation..
For a signed permutation $\sigma$, this equals
$$ \left\lfloor \dfrac{fexc(\sigma)+1}{2} \right\rfloor = exc(\sigma) + \left\lfloor \dfrac{neg(\sigma)+1}{2} \right\rfloor, $$
where
$$fexc(\sigma) = 2exc(\sigma) + neg(\sigma),$$
$$exc(\sigma) = |\{i \in [n-1] \,:\, \sigma(i) > i\}|,$$
$$neg(\sigma) = |\{i \in [n] \,:\, \sigma(i) < 0\}|.$$
This statistic has the same distribution as the descent statistic St001427The number of descents of a signed permutation..
Map
to 312-avoiding permutation
Description
Map
major-index to inversion-number bijection
Description
Return the permutation whose Lehmer code equals the major code of the preimage.
This map sends the major index to the number of inversions.
This map sends the major index to the number of inversions.
Map
to signed permutation
Description
The signed permutation with all signs positive.
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