A263486 Triangle read by rows: T(n,k) (n>=2, k>=1) is the number of permutations w of n for which the Kazhdan-Lusztig polynomial P(id,w;q) evaluated to k at q=1.

2, 6, 22, 2, 88, 27, 4, 1

Offset

2,1

Comments

Row sums give A000142, n >= 2.

Links

Table of n, a(n) for n=2..9.

FindStat - Combinatorial Statistic Finder, The evaluation of the Kazhdan-Lusztig polynomial P(id,w) for each permutation w in S_n evaluated at q=1.

Wikipedia, Kazhdan-Lusztig polynomial

Example

Triangle begins:
2,
6,
22,2,
88,27,4,1,
...

Crossrefs

Cf. A000142.

Sequence in context: A084392 A156155 A317725 * A182544 A216120 A216964

Adjacent sequences: A263483 A263484 A263485 * A263487 A263488 A263489

Keyword

nonn,tabf,more

Author

Christian Stump, Oct 19 2015

Status

approved