A274861 - cp's OEIS frontend

A274861 Number of set partitions of [n] such that the difference between each element and its index (in the partition) is a multiple of four.

n	a(n)
0	1
1	1
2	2
3	4
4	8
5	16
6	32
7	64
8	128
9	264
10	544
11	1120
12	2304
13	4940
14	10632
15	22908
16	49324
17	112352
18	258184
19	596430
20	1379150
21	3431265
22	8639020
23	21965049
24	56062850
25	155582125
26	436328469
27	1238168841
28	3534962983
29	10951026755
30	34135076965
31	107562008116
32	341226376721

[1, 1, 2, 4, 8, 16, 32, 64, 128, 264, 544, 1120, 2304, 4940, 10632, 22908, 49324, 112352, 258184, 596430, 1379150, 3431265, 8639020, 21965049, 56062850, 155582125, 436328469, 1238168841, 3534962983, 10951026755, 34135076965, 107562008116, 341226376721]

cp's OEIS Frontend

A274861 Number of set partitions of [n] such that the difference between each element and its index (in the partition) is a multiple of four.

Table of values

List of values