A272432 - cp's OEIS frontend

A272432 Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its four immediate predecessors.

n	a(n)
0	1
1	1
2	1
3	7
4	9
5	31
6	403
7	757
8	2873
9	12607
10	333051
11	761377
12	3699435
13	16383121
14	108710085
15	4855474267
16	28123899993
17	241045678351
18	2865769028107
19	22701288941281
20	238433702214659
21	4399193720759677
22	46157742163810905
23	514035796837721671
24	8889375296702138075

[1, 1, 1, 7, 9, 31, 403, 757, 2873, 12607, 333051, 761377, 3699435, 16383121, 108710085, 4855474267, 28123899993, 241045678351, 2865769028107, 22701288941281, 238433702214659, 4399193720759677, 46157742163810905, 514035796837721671, 8889375296702138075]

cp's OEIS Frontend

A272432 Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its four immediate predecessors.

Table of values

List of values