A309895 Number of floor(n/2)-uniform hypergraphs on n unlabeled nodes.

2, 2, 3, 4, 11, 34, 2136, 7013320, 29281354514767168, 234431745534048922731115555415680, 1994324729203114587259985605157804740271034553359179870979936357974016

Offset

0,1

Comments

A hypergraph is called k-uniform if all hyperedges have the same cardinality k.

Links

Alois P. Heinz, Table of n, a(n) for n = 0..14

Wikipedia, Hypergraph

Formula

a(n) = A309858(n,floor(n/2)) = A309865(n,floor(n/2)).

Crossrefs

Cf. A309858, A309865.

Sequence in context: A205118 A363745 A022405 * A361246 A375791 A270744

Adjacent sequences: A309892 A309893 A309894 * A309896 A309897 A309898

Keyword

nonn

Author

Alois P. Heinz, Aug 21 2019

Status

approved