A274837 - cp's OEIS frontend

A274837 Number of set partitions of [n] such that the difference between each element and its block index is a multiple of four.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	3
7	4
8	5
9	11
10	22
11	41
12	72
13	191
14	459
15	1033
16	2209
17	6696
18	18777
19	49526
20	124011
21	419203
22	1329966
23	4009931
24	11544970
25	43203329
26	152247581
27	511143253
28	1644388769
29	6707557342
30	25952578959
31	95992345048
32	340793163873
33	1501194339387
34	6305017609678

[1, 1, 1, 1, 1, 2, 3, 4, 5, 11, 22, 41, 72, 191, 459, 1033, 2209, 6696, 18777, 49526, 124011, 419203, 1329966, 4009931, 11544970, 43203329, 152247581, 511143253, 1644388769, 6707557342, 25952578959, 95992345048, 340793163873, 1501194339387, 6305017609678]

cp's OEIS Frontend

A274837 Number of set partitions of [n] such that the difference between each element and its block index is a multiple of four.

Table of values

List of values