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A058801 Number of connected vertically indecomposable partial lattices on n unlabeled nodes. 0
1, 2, 6, 25, 116, 625, 3757, 25140, 184511, 1473861, 12711339, 117598686, 1160399052, 12152333659, 134487937252 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

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

N. J. A. Sloane, Transforms

FORMULA

Inverse EULER transform of A058800(n+2).

CROSSREFS

Cf. A006966.

Sequence in context: A014277 A006965 A202705 * A074010 A030806 A030828

Adjacent sequences:  A058798 A058799 A058800 * A058802 A058803 A058804

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Dec 28 2000

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.