A287671 - cp's OEIS frontend

A287671 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-8 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	678569
12	4213333
13	27634757
14	190697165
15	1379679500
16	10433619205
17	82253035850
18	674373619108
19	5738060816421
20	50573749394877
21	460936356129618
22	4337525923676113
23	42084057817903853
24	420444371318055912

[1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115975, 678569, 4213333, 27634757, 190697165, 1379679500, 10433619205, 82253035850, 674373619108, 5738060816421, 50573749394877, 460936356129618, 4337525923676113, 42084057817903853, 420444371318055912]

cp's OEIS Frontend

A287671 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-8 is member of a block >= b-1.

Table of values

List of values