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A058164 Number of labeled lattices with a fixed bottom. 4
1, 1, 2, 9, 76, 1065, 22566, 674611, 27019896, 1393871121, 89805306250, 7051089328371, 661327038073428, 72882388902988561, 9308502142507505406, 1361778362223282167235, 225917426273413368357616, 42135305039539420956486369 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

A055512 = Cases[Import["https://oeis.org/A055512/b055512.txt", "Table"], {_, _}][[All, 2]];

a[n_] := A055512[[n + 1]]/n;

a /@ Range[18] (* Jean-François Alcover, Jan 02 2020 *)

CROSSREFS

a(n) = A055512(n)/n = A058165(n)*(n-1). Main diagonal of A058160.

Sequence in context: A123680 A132621 A108992 * A006059 A277406 A182947

Adjacent sequences:  A058161 A058162 A058163 * A058165 A058166 A058167

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Nov 15 2000

EXTENSIONS

a(18) from Jean-François Alcover, Jan 02 2020

STATUS

approved

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Last modified April 12 01:36 EDT 2021. Contains 342912 sequences. (Running on oeis4.)