A262126 - cp's OEIS frontend

A262126 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value <= 2.

n	a(n)
0	1
1	1
2	1
3	3
4	8
5	40
6	162
7	1134
8	6128
9	55152
10	372560
11	4098160
12	33220512
13	431866656
14	4084265360
15	61263980400
16	662157708032
17	11256681036544
18	136873417800960
19	2600594938218240
20	35134918875668480
21	737833296389038080
22	10965215649174414848
23	252199959931011541504

[1, 1, 1, 3, 8, 40, 162, 1134, 6128, 55152, 372560, 4098160, 33220512, 431866656, 4084265360, 61263980400, 662157708032, 11256681036544, 136873417800960, 2600594938218240, 35134918875668480, 737833296389038080, 10965215649174414848, 252199959931011541504]

cp's OEIS Frontend

A262126 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value <= 2.

Table of values

List of values