A055788 Number of symmetric types of (5,2n)-hypergraphs under action of complementing group C(5,2).

1, 31, 186, 1581, 7316, 30039, 103974, 330429, 947050, 2533289, 6325550, 14969435, 33665380, 72544185, 150236850, 300540195, 582235491, 1096087770, 2009383420, 3595937070, 6292703640, 10787811210, 18142828740, 29975617710

Offset

0,2

Links

Table of n, a(n) for n=0..23.

Formula

G.f.: (62/(1-x^2)^16-310/(1-x^4)^8+1240/(1-x^8)^4-1984/(1-x^16)^2+1024/(1-x^32))/32.

Crossrefs

Cf. A051502.

Sequence in context: A373519 A243522 A227523 * A042876 A042878 A165130

Adjacent sequences: A055785 A055786 A055787 * A055789 A055790 A055791

Keyword

nonn

Author

Vladeta Jovovic, Jul 13 2000

Extensions

More terms from James A. Sellers, Aug 22 2000

Status

approved