A275071 - cp's OEIS frontend

A275071 Number of set partitions of [n] such that i-j is a multiple of four for all i,j belonging to the same block.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	4
7	8
8	16
9	40
10	100
11	250
12	625
13	1875
14	5625
15	16875
16	50625
17	175500
18	608400
19	2109120
20	7311616
21	28543424
22	111429136
23	435002204
24	1698181681
25	7336479479
26	31695036961
27	136928804999
28	591559418641
29	2792538190620
30	13182563408400
31	62230116888000

[1, 1, 1, 1, 1, 2, 4, 8, 16, 40, 100, 250, 625, 1875, 5625, 16875, 50625, 175500, 608400, 2109120, 7311616, 28543424, 111429136, 435002204, 1698181681, 7336479479, 31695036961, 136928804999, 591559418641, 2792538190620, 13182563408400, 62230116888000]

cp's OEIS Frontend

A275071 Number of set partitions of [n] such that i-j is a multiple of four for all i,j belonging to the same block.

Table of values

List of values