_Christian G. Bower (bowerc(AT)usa.net), _, Dec 28 2000
OEIS Server: https://oeis.org/edit/global/178
Vertically indecomposable lattices on n labeled nodes.
1, 1, 2, 0, 12, 140, 2910, 83202, 3170216, 154933704, 9441522810, 701275774430, 62304994315212, 6517432341289740, 791949368757587222, 110496962589020946330, 17525486812000086847440
0,3
a(n)=A058804(n)*n=A058805(n)*n*(n-1).
nonn,hard
Christian G. Bower (bowerc(AT)usa.net), Dec 28 2000
approved