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Vertically indecomposable lattices on n labeled nodes.
2

%I #2 Mar 30 2012 17:37:12

%S 1,1,2,0,12,140,2910,83202,3170216,154933704,9441522810,701275774430,

%T 62304994315212,6517432341289740,791949368757587222,

%U 110496962589020946330,17525486812000086847440

%N Vertically indecomposable lattices on n labeled nodes.

%Y a(n)=A058804(n)*n=A058805(n)*n*(n-1).

%K nonn,hard

%O 0,3

%A _Christian G. Bower_, Dec 28 2000