A110103 - cp's OEIS frontend

A110103 a(n) is the number of 2-regular 4-hypergraphs on 2n labeled vertices. (In a r-hypergraph, each hyper-edge is a proper r-set; k-regular implies that each vertex is in exactly k hyperedges.)

n	a(n)
0	1
1	0
2	0
3	15
4	1855
5	469980
6	214402650
7	160081596675
8	182667234224475
9	302414315250247200
10	697372026302486234700
11	2167773244010692751057625
12	8842276105055583472501844625
13	46275602006744820263447546152500

[1, 0, 0, 15, 1855, 469980, 214402650, 160081596675, 182667234224475, 302414315250247200, 697372026302486234700, 2167773244010692751057625, 8842276105055583472501844625, 46275602006744820263447546152500]

cp's OEIS Frontend

A110103 a(n) is the number of 2-regular 4-hypergraphs on 2n labeled vertices. (In a r-hypergraph, each hyper-edge is a proper r-set; k-regular implies that each vertex is in exactly k hyperedges.)

Table of values

List of values