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.
Table of n, a(n) for n=0..16.
N. J. A. Sloane, Transforms
Inverse Euler transform of A006966(n-2) (lattices)
Sequence in context: A225041 A074507 A217924 * A097277 A034428 A101880
Adjacent sequences: A030265 A030266 A030267 * A030269 A030270 A030271
Christian G. Bower, revised Dec 28, 2000