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A058803 Vertically indecomposable lattices on n labeled nodes. 2
1, 1, 2, 0, 12, 140, 2910, 83202, 3170216, 154933704, 9441522810, 701275774430, 62304994315212, 6517432341289740, 791949368757587222, 110496962589020946330, 17525486812000086847440 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

CROSSREFS

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

Sequence in context: A180189 A013316 A013310 * A193202 A107700 A122688

Adjacent sequences:  A058800 A058801 A058802 * A058804 A058805 A058806

KEYWORD

nonn,hard

AUTHOR

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

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Last modified February 16 16:00 EST 2012. Contains 205938 sequences.