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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
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
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 March 3 14:31 EST 2024. Contains 370512 sequences. (Running on oeis4.)