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Vertically decomposable lattices on n unlabeled nodes.
0

%I #14 Aug 06 2024 06:54:46

%S 1,1,3,8,26,96,414,2040,11432,72022,503973,3875329,32429747,292872455,

%T 2834089224,29209213572,318979706486

%N Vertically decomposable lattices on n unlabeled nodes.

%H J. Heitzig and J. Reinhold, <a href="https://citeseerx.ist.psu.edu/pdf/4186ccb354bdd7f32931eabef3c85f8459f5b292">Counting finite lattices</a>, preprint no. 298, Institut für Mathematik, Universität Hanover, Germany, 1999.

%H J. Heitzig and J. Reinhold, <a href="https://doi.org/10.1007/PL00013837">Counting finite lattices</a>, Algebra Universalis, 48 (2002), 43-53.

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

%Y Cf. A006966, A058800.

%K nonn,hard

%O 3,3

%A _Christian G. Bower_, Dec 28 2000