A068255 1/5 the number of colorings of an n X n square array with 5 colors.

1, 52, 28564, 165770032, 10164078082036, 6584229526795818280, 45062665956031451017237456, 3258395057698765483724093981321824, 2489232886416012985921659124731697904597044, 20091032492258710696689787524926465967570325433558752

Offset

1,2

Links

Jean-François Alcover, Table of n, a(n) for n = 1..14

Mathematica

A222144 = Cases[Import["https://oeis.org/A222144/b222144.txt", "Table"], {_, _}][[All, 2]];
a[n_] := A222144[[2 n^2 - 2 n + 1]];
Table[a[n], {n, 1, 14}] (* Jean-François Alcover, Sep 23 2019 *)

Crossrefs

Main diagonal of A222144.

Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406.

Sequence in context: A200806 A208305 A098148 * A230532 A157280 A182924

Adjacent sequences: A068252 A068253 A068254 * A068256 A068257 A068258

Keyword

nonn

Author

R. H. Hardin, Feb 24 2002

Extensions

a(8)-a(10) from Alois P. Heinz, Apr 27 2012

Status

approved