A287672 - cp's OEIS frontend

A287672 Number of set partitions of [n] such that j is member of block b only if b = 1 or at least one of j-1, ..., j-9 is member of a block >= b-1.

n	a(n)
0	1
1	1
2	2
3	5
4	15
5	52
6	203
7	877
8	4140
9	21147
10	115975
11	678570
12	4213596
13	27643917
14	190873448
15	1382311874
16	10468191626
17	82676728870
18	679376431959
19	5796059673820
20	51241781683988
21	468639956185787
22	4426928995172738
23	43131913020157751
24	432877526792148982

[1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115975, 678570, 4213596, 27643917, 190873448, 1382311874, 10468191626, 82676728870, 679376431959, 5796059673820, 51241781683988, 468639956185787, 4426928995172738, 43131913020157751, 432877526792148982]

cp's OEIS Frontend

A287672 Number of set partitions of [n] such that j is member of block b only if b = 1 or at least one of j-1, ..., j-9 is member of a block >= b-1.

Table of values

List of values