A287669 - cp's OEIS frontend

A287669 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-6 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	21146
10	115903
11	677026
12	4190648
13	27356008
14	187573260
15	1346289439
16	10084570537
17	78630320221
18	636692795555
19	5342949225111
20	46381106554291
21	415803352327861
22	3843867571153341
23	36592205230965683
24	358266592635074429

[1, 1, 2, 5, 15, 52, 203, 877, 4140, 21146, 115903, 677026, 4190648, 27356008, 187573260, 1346289439, 10084570537, 78630320221, 636692795555, 5342949225111, 46381106554291, 415803352327861, 3843867571153341, 36592205230965683, 358266592635074429]

cp's OEIS Frontend

A287669 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-6 is member of a block >= b-1.

Table of values

List of values