A058802 Vertically decomposable lattices on n unlabeled nodes.

1, 1, 3, 8, 26, 96, 414, 2040, 11432, 72022, 503973, 3875329, 32429747, 292872455, 2834089224, 29209213572, 318979706486

Offset

3,3

Links

Table of n, a(n) for n=3..19.

J. Heitzig and J. Reinhold, Counting finite lattices, preprint no. 298, Institut für Mathematik, Universität Hanover, Germany, 1999.

J. Heitzig and J. Reinhold, Counting finite lattices, Algebra Universalis, 48 (2002), 43-53.

Formula

a(n) = A006966(n) - A058800(n).

Crossrefs

Cf. A006966, A058800.

Sequence in context: A320344 A006870 A348620 * A054097 A238243 A298624

Adjacent sequences: A058799 A058800 A058801 * A058803 A058804 A058805

Keyword

nonn,hard

Author

Christian G. Bower, Dec 28 2000

Status

approved