Identifier
-
Mp00129:
Dyck paths
—to 321-avoiding permutation (Billey-Jockusch-Stanley)⟶
Permutations
St000221: Permutations ⟶ ℤ
Values
[1,0] => [1] => 1
[1,0,1,0] => [2,1] => 0
[1,1,0,0] => [1,2] => 2
[1,0,1,0,1,0] => [2,3,1] => 0
[1,0,1,1,0,0] => [2,1,3] => 1
[1,1,0,0,1,0] => [1,3,2] => 1
[1,1,0,1,0,0] => [3,1,2] => 0
[1,1,1,0,0,0] => [1,2,3] => 3
[1,0,1,0,1,0,1,0] => [2,3,4,1] => 0
[1,0,1,0,1,1,0,0] => [2,3,1,4] => 1
[1,0,1,1,0,0,1,0] => [2,1,4,3] => 0
[1,0,1,1,0,1,0,0] => [2,4,1,3] => 0
[1,0,1,1,1,0,0,0] => [2,1,3,4] => 2
[1,1,0,0,1,0,1,0] => [1,3,4,2] => 1
[1,1,0,0,1,1,0,0] => [1,3,2,4] => 2
[1,1,0,1,0,0,1,0] => [3,1,4,2] => 0
[1,1,0,1,0,1,0,0] => [3,4,1,2] => 0
[1,1,0,1,1,0,0,0] => [3,1,2,4] => 1
[1,1,1,0,0,0,1,0] => [1,2,4,3] => 2
[1,1,1,0,0,1,0,0] => [1,4,2,3] => 1
[1,1,1,0,1,0,0,0] => [4,1,2,3] => 0
[1,1,1,1,0,0,0,0] => [1,2,3,4] => 4
[1,0,1,0,1,0,1,0,1,0] => [2,3,4,5,1] => 0
[1,0,1,0,1,0,1,1,0,0] => [2,3,4,1,5] => 1
[1,0,1,0,1,1,0,0,1,0] => [2,3,1,5,4] => 0
[1,0,1,0,1,1,0,1,0,0] => [2,3,5,1,4] => 0
[1,0,1,0,1,1,1,0,0,0] => [2,3,1,4,5] => 2
[1,0,1,1,0,0,1,0,1,0] => [2,1,4,5,3] => 0
[1,0,1,1,0,0,1,1,0,0] => [2,1,4,3,5] => 1
[1,0,1,1,0,1,0,0,1,0] => [2,4,1,5,3] => 0
[1,0,1,1,0,1,0,1,0,0] => [2,4,5,1,3] => 0
[1,0,1,1,0,1,1,0,0,0] => [2,4,1,3,5] => 1
[1,0,1,1,1,0,0,0,1,0] => [2,1,3,5,4] => 1
[1,0,1,1,1,0,0,1,0,0] => [2,1,5,3,4] => 0
[1,0,1,1,1,0,1,0,0,0] => [2,5,1,3,4] => 0
[1,0,1,1,1,1,0,0,0,0] => [2,1,3,4,5] => 3
[1,1,0,0,1,0,1,0,1,0] => [1,3,4,5,2] => 1
[1,1,0,0,1,0,1,1,0,0] => [1,3,4,2,5] => 2
[1,1,0,0,1,1,0,0,1,0] => [1,3,2,5,4] => 1
[1,1,0,0,1,1,0,1,0,0] => [1,3,5,2,4] => 1
[1,1,0,0,1,1,1,0,0,0] => [1,3,2,4,5] => 3
[1,1,0,1,0,0,1,0,1,0] => [3,1,4,5,2] => 0
[1,1,0,1,0,0,1,1,0,0] => [3,1,4,2,5] => 1
[1,1,0,1,0,1,0,0,1,0] => [3,4,1,5,2] => 0
[1,1,0,1,0,1,0,1,0,0] => [3,4,5,1,2] => 0
[1,1,0,1,0,1,1,0,0,0] => [3,4,1,2,5] => 1
[1,1,0,1,1,0,0,0,1,0] => [3,1,2,5,4] => 0
[1,1,0,1,1,0,0,1,0,0] => [3,1,5,2,4] => 0
[1,1,0,1,1,0,1,0,0,0] => [3,5,1,2,4] => 0
[1,1,0,1,1,1,0,0,0,0] => [3,1,2,4,5] => 2
[1,1,1,0,0,0,1,0,1,0] => [1,2,4,5,3] => 2
[1,1,1,0,0,0,1,1,0,0] => [1,2,4,3,5] => 3
[1,1,1,0,0,1,0,0,1,0] => [1,4,2,5,3] => 1
[1,1,1,0,0,1,0,1,0,0] => [1,4,5,2,3] => 1
[1,1,1,0,0,1,1,0,0,0] => [1,4,2,3,5] => 2
[1,1,1,0,1,0,0,0,1,0] => [4,1,2,5,3] => 0
[1,1,1,0,1,0,0,1,0,0] => [4,1,5,2,3] => 0
[1,1,1,0,1,0,1,0,0,0] => [4,5,1,2,3] => 0
[1,1,1,0,1,1,0,0,0,0] => [4,1,2,3,5] => 1
[1,1,1,1,0,0,0,0,1,0] => [1,2,3,5,4] => 3
[1,1,1,1,0,0,0,1,0,0] => [1,2,5,3,4] => 2
[1,1,1,1,0,0,1,0,0,0] => [1,5,2,3,4] => 1
[1,1,1,1,0,1,0,0,0,0] => [5,1,2,3,4] => 0
[1,1,1,1,1,0,0,0,0,0] => [1,2,3,4,5] => 5
[1,0,1,0,1,0,1,0,1,0,1,0] => [2,3,4,5,6,1] => 0
[1,0,1,0,1,0,1,0,1,1,0,0] => [2,3,4,5,1,6] => 1
[1,0,1,0,1,0,1,1,0,0,1,0] => [2,3,4,1,6,5] => 0
[1,0,1,0,1,0,1,1,0,1,0,0] => [2,3,4,6,1,5] => 0
[1,0,1,0,1,0,1,1,1,0,0,0] => [2,3,4,1,5,6] => 2
[1,0,1,0,1,1,0,0,1,0,1,0] => [2,3,1,5,6,4] => 0
[1,0,1,0,1,1,0,0,1,1,0,0] => [2,3,1,5,4,6] => 1
[1,0,1,0,1,1,0,1,0,0,1,0] => [2,3,5,1,6,4] => 0
[1,0,1,0,1,1,0,1,0,1,0,0] => [2,3,5,6,1,4] => 0
[1,0,1,0,1,1,0,1,1,0,0,0] => [2,3,5,1,4,6] => 1
[1,0,1,0,1,1,1,0,0,0,1,0] => [2,3,1,4,6,5] => 1
[1,0,1,0,1,1,1,0,0,1,0,0] => [2,3,1,6,4,5] => 0
[1,0,1,0,1,1,1,0,1,0,0,0] => [2,3,6,1,4,5] => 0
[1,0,1,0,1,1,1,1,0,0,0,0] => [2,3,1,4,5,6] => 3
[1,0,1,1,0,0,1,0,1,0,1,0] => [2,1,4,5,6,3] => 0
[1,0,1,1,0,0,1,0,1,1,0,0] => [2,1,4,5,3,6] => 1
[1,0,1,1,0,0,1,1,0,0,1,0] => [2,1,4,3,6,5] => 0
[1,0,1,1,0,0,1,1,0,1,0,0] => [2,1,4,6,3,5] => 0
[1,0,1,1,0,0,1,1,1,0,0,0] => [2,1,4,3,5,6] => 2
[1,0,1,1,0,1,0,0,1,0,1,0] => [2,4,1,5,6,3] => 0
[1,0,1,1,0,1,0,0,1,1,0,0] => [2,4,1,5,3,6] => 1
[1,0,1,1,0,1,0,1,0,0,1,0] => [2,4,5,1,6,3] => 0
[1,0,1,1,0,1,0,1,0,1,0,0] => [2,4,5,6,1,3] => 0
[1,0,1,1,0,1,0,1,1,0,0,0] => [2,4,5,1,3,6] => 1
[1,0,1,1,0,1,1,0,0,0,1,0] => [2,4,1,3,6,5] => 0
[1,0,1,1,0,1,1,0,0,1,0,0] => [2,4,1,6,3,5] => 0
[1,0,1,1,0,1,1,0,1,0,0,0] => [2,4,6,1,3,5] => 0
[1,0,1,1,0,1,1,1,0,0,0,0] => [2,4,1,3,5,6] => 2
[1,0,1,1,1,0,0,0,1,0,1,0] => [2,1,3,5,6,4] => 1
[1,0,1,1,1,0,0,0,1,1,0,0] => [2,1,3,5,4,6] => 2
[1,0,1,1,1,0,0,1,0,0,1,0] => [2,1,5,3,6,4] => 0
[1,0,1,1,1,0,0,1,0,1,0,0] => [2,1,5,6,3,4] => 0
[1,0,1,1,1,0,0,1,1,0,0,0] => [2,1,5,3,4,6] => 1
[1,0,1,1,1,0,1,0,0,0,1,0] => [2,5,1,3,6,4] => 0
[1,0,1,1,1,0,1,0,0,1,0,0] => [2,5,1,6,3,4] => 0
[1,0,1,1,1,0,1,0,1,0,0,0] => [2,5,6,1,3,4] => 0
[1,0,1,1,1,0,1,1,0,0,0,0] => [2,5,1,3,4,6] => 1
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Description
The number of strong fixed points of a permutation.
$i$ is called a strong fixed point of $\pi$ if
1. $j < i$ implies $\pi_j < \pi_i$, and
2. $j > i$ implies $\pi_j > \pi_i$
This can be described as an occurrence of the mesh pattern ([1], {(0,1),(1,0)}), i.e., the upper left and the lower right quadrants are shaded, see [3].
The generating function for the joint-distribution (RLmin, LRmax, strong fixed points) has a continued fraction expression as given in [4, Lemma 3.2], for LRmax see St000314The number of left-to-right-maxima of a permutation..
$i$ is called a strong fixed point of $\pi$ if
1. $j < i$ implies $\pi_j < \pi_i$, and
2. $j > i$ implies $\pi_j > \pi_i$
This can be described as an occurrence of the mesh pattern ([1], {(0,1),(1,0)}), i.e., the upper left and the lower right quadrants are shaded, see [3].
The generating function for the joint-distribution (RLmin, LRmax, strong fixed points) has a continued fraction expression as given in [4, Lemma 3.2], for LRmax see St000314The number of left-to-right-maxima of a permutation..
Map
to 321-avoiding permutation (Billey-Jockusch-Stanley)
Description
The Billey-Jockusch-Stanley bijection to 321-avoiding permutations.
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