A088895 Number of intersecting T_0-antichains on a labeled n-set.

1, 2, 2, 4, 41, 2104, 1387915, 229780525655

Offset

0,2

Comments

An antichain on a set is a T_0-antichain if for every two distinct pointsf the set there exists a member of the antichain containing one but not the other point.

Links

Table of n, a(n) for n=0..7.

Crossrefs

Cf. A001206, A051185, A059083.

Sequence in context: A257617 A309344 A257618 * A257619 A075806 A295580

Adjacent sequences: A088892 A088893 A088894 * A088896 A088897 A088898

Keyword

hard,nonn

Author

Goran Kilibarda, Vladeta Jovovic, Nov 28 2003

Status

approved