OFFSET
0,1
COMMENTS
An antichain on a set is a T_0-antichain if for every two distinct points of the set there exists a member of the antichain containing one but not the other point.
REFERENCES
V. Jovovic, G. Kilibarda, On enumeration of the class of all monotone Boolean functions, in preparation.
LINKS
V. Jovovic, 3-element T_0-antichains on a labeled 4-set
V. Jovovic, G. Kilibarda, On the number of Boolean functions in the Post classes F^{mu}_8, Diskretnaya Matematika, 11 (1999), no. 4, 127-138 (translated in Discrete Mathematics and Applications, 9, (1999), no. 6).
FORMULA
EXAMPLE
a(0) = 1 + 1, a(1) = 1 + 2, a(2) = 2 + 1, a(3) = 6 + 2, a(4) = 12 + 52 + 25 + 6 + 1, a(5) = 520 + 1770 + 2086 + 1370 + 490 + 115 + 20 + 2.
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Vladeta Jovovic, Goran Kilibarda, Jan 06 2001
EXTENSIONS
More terms from Vladeta Jovovic, Nov 28 2003
STATUS
approved