A276894 - cp's OEIS frontend

A276894 Number of ordered set partitions of [n] such that for each block b the smallest integer interval containing b has at most four elements.

n	a(n)
0	1
1	1
2	3
3	13
4	75
5	466
6	3272
7	26032
8	232820
9	2304600
10	25003176
11	295139034
12	3767545662
13	51729553992
14	760326663792
15	11913105530016
16	198246166468224
17	3492246172917240
18	64928731038925800
19	1270685662509505560
20	26112819120798942120
21	562241528313838756560

[1, 1, 3, 13, 75, 466, 3272, 26032, 232820, 2304600, 25003176, 295139034, 3767545662, 51729553992, 760326663792, 11913105530016, 198246166468224, 3492246172917240, 64928731038925800, 1270685662509505560, 26112819120798942120, 562241528313838756560]

cp's OEIS Frontend

A276894 Number of ordered set partitions of [n] such that for each block b the smallest integer interval containing b has at most four elements.

Table of values

List of values