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A068256 1/6 the number of colorings of an n X n square array with 6 colors.

%I A068256 #17 Sep 23 2019 06:27:32
%S A068256 1,105,194485,6354787485,3662978221194885,37246546285522069805565,
%T A068256 6681224184095576349599961437005,
%U A068256 21141920893108925844961568245788270386085,1180188030501408210062775052100916976604905321333565,1162187850685436026547128866816039344195930156602955871508107885
%N A068256 1/6 the number of colorings of an n X n square array with 6 colors.
%H A068256 Jean-François Alcover, <a href="/A068256/b068256.txt">Table of n, a(n) for n = 1..13</a>
%t A068256 A222281 = Cases[Import["https://oeis.org/A222281/b222281.txt", "Table"], {_, _}][[All, 2]];
%t A068256 a[n_] := A222281[[2 n^2 - 2 n + 1]];
%t A068256 Table[a[n], {n, 1, 13}] (* _Jean-François Alcover_, Sep 23 2019 *)
%Y A068256 Main diagonal of A222281.
%Y A068256 Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406.
%K A068256 nonn
%O A068256 1,2
%A A068256 _R. H. Hardin_, Feb 24 2002
%E A068256 a(8)-a(10) from _Alois P. Heinz_, Apr 27 2012