A290306 - cp's OEIS frontend

A290306 Number of permutations of the multiset {1,1,2,2,...,2n,2n} having exactly n ascents and no number smaller than k between the two occurrences of any number k.

n	a(n)
0	1
1	2
2	58
3	4400
4	644020
5	155357384
6	56041398784
7	28299910066112
8	19076135772884080
9	16558710676700081120
10	17997592513561138205728
11	23948993629880321407298816
12	38303802347672648465676584704
13	72510806370598644118983905976320
14	160368191672482402606757066578885120

[1, 2, 58, 4400, 644020, 155357384, 56041398784, 28299910066112, 19076135772884080, 16558710676700081120, 17997592513561138205728, 23948993629880321407298816, 38303802347672648465676584704, 72510806370598644118983905976320, 160368191672482402606757066578885120]

cp's OEIS Frontend

A290306 Number of permutations of the multiset {1,1,2,2,...,2n,2n} having exactly n ascents and no number smaller than k between the two occurrences of any number k.

Table of values

List of values