A274875 - cp's OEIS frontend

A274875 Number of set partitions of [2n] into exactly n blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.

n	a(n)
0	1
1	0
2	1
3	3
4	35
5	226
6	3632
7	36780
8	770481
9	10677444
10	277114769
11	4882093495
12	151410615066
13	3238949008872
14	116936529884088
15	2943848265346408
16	121318690777898613
17	3513774792447267240
18	162794429514873454259
19	5332375501915984656921
20	274393112247007415104839

[1, 0, 1, 3, 35, 226, 3632, 36780, 770481, 10677444, 277114769, 4882093495, 151410615066, 3238949008872, 116936529884088, 2943848265346408, 121318690777898613, 3513774792447267240, 162794429514873454259, 5332375501915984656921, 274393112247007415104839]

cp's OEIS Frontend

A274875 Number of set partitions of [2n] into exactly n blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.

Table of values

List of values