A287670 - cp's OEIS frontend

A287670 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-7 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	115974
11	678434
12	4209827
13	27578206
14	189954361
15	1370870811
16	10334533723
17	81166980407
18	662588540048
19	5610196619724
20	49177794178940
21	445536788068643
22	4165402700226511
23	40131393651398259
24	397935154986242021

[1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115974, 678434, 4209827, 27578206, 189954361, 1370870811, 10334533723, 81166980407, 662588540048, 5610196619724, 49177794178940, 445536788068643, 4165402700226511, 40131393651398259, 397935154986242021]

cp's OEIS Frontend

A287670 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-7 is member of a block >= b-1.

Table of values

List of values