A088888 Number of intersecting T_0-hypergraphs on a labeled n-set.

2, 4, 26, 1190, 1302204, 912799349556, 291201248247281713961832

Offset

1,1

Comments

Intersecting hypergraph is intersecting T_0-hypergraph if for every two distinct nodes there exists a hyperedge containing one but not the other node.

Links

Table of n, a(n) for n=1..7.

Crossrefs

Cf. A051185, A059083.

Sequence in context: A182146 A218077 A240040 * A102996 A358563 A189896

Adjacent sequences: A088885 A088886 A088887 * A088889 A088890 A088891

Keyword

hard,nonn

Author

Goran Kilibarda, Vladeta Jovovic, Nov 28 2003

Status

approved