A262127 - cp's OEIS frontend

A262127 Number of permutations p of [2n] such that the up-down signature of p has nonnegative partial sums with a maximal value of n.

n	a(n)
0	1
1	1
2	3
3	57
4	778
5	47673
6	1477381
7	196352061
8	10896848134
9	2539183745028
10	220995092995233
11	79875004816604671
12	10032237471596350240
13	5198811549997063847059
14	890008776794671492878641
15	626002734896306246681963237
16	140112228518254335504033414806

[1, 1, 3, 57, 778, 47673, 1477381, 196352061, 10896848134, 2539183745028, 220995092995233, 79875004816604671, 10032237471596350240, 5198811549997063847059, 890008776794671492878641, 626002734896306246681963237, 140112228518254335504033414806]

cp's OEIS Frontend

A262127 Number of permutations p of [2n] such that the up-down signature of p has nonnegative partial sums with a maximal value of n.

Table of values

List of values