A002873 - cp's OEIS frontend

A002873 The maximal number of partitions of {1..2n} that are invariant under a permutation consisting of n 2-cycles, and which have the same number of nonempty parts.

n	a(n)
0	1
1	1
2	3
3	10
4	53
5	265
6	1700
7	13097
8	96796
9	829080
10	8009815
11	75604892
12	808861988
13	9175286549
14	106167118057
15	1320388106466
16	16950041305210
17	233232366601078
18	3243603207488124
19	47776065074368313
20	733990397879859192
21	11515503147927664816
22	189107783918416912912

[1, 1, 3, 10, 53, 265, 1700, 13097, 96796, 829080, 8009815, 75604892, 808861988, 9175286549, 106167118057, 1320388106466, 16950041305210, 233232366601078, 3243603207488124, 47776065074368313, 733990397879859192, 11515503147927664816, 189107783918416912912]

cp's OEIS Frontend

A002873 The maximal number of partitions of {1..2n} that are invariant under a permutation consisting of n 2-cycles, and which have the same number of nonempty parts.

Table of values

List of values