A058165 - OEIS

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A058165

Number of labeled lattices with fixed a fixed bottom and top.

1, 1, 3, 19, 213, 3761, 96373, 3377487, 154874569, 8980530625, 641008120761, 55110586506119, 5606337607922197, 664893010179107529, 90785224148218811149, 14119839142088335522351, 2478547355267024762146257

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,3

LINKS

Table of n, a(n) for n=2..18.

FORMULA

a(n) = A055512(n)/(n*(n-1)) = A058164(n)/(n-1).

MATHEMATICA

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

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

a /@ Range[2, 18] (* Jean-François Alcover, Jan 02 2020 *)

CROSSREFS