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A030268 Number of nonisomorphic connected partial lattices. 1
1, 1, 1, 3, 9, 35, 153, 791, 4597, 29988, 215804, 1697291, 14457059, 132392971, 1295346365, 13468653637, 148142236784 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

A partial lattice is a poset where every pair of points has a unique least upper (greatest lower) bound or has no upper (lower) bound.

LINKS

Table of n, a(n) for n=0..16.

N. J. A. Sloane, Transforms

FORMULA

Inverse Euler transform of A006966(n-2) (lattices).

CROSSREFS

Sequence in context: A225041 A074507 A217924 * A097277 A034428 A101880

Adjacent sequences:  A030265 A030266 A030267 * A030269 A030270 A030271

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, revised Dec 28 2000

STATUS

approved

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Last modified January 20 14:40 EST 2019. Contains 319333 sequences. (Running on oeis4.)