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1/5 of the number of 5-colorings of an n X n array symmetric about both diagonal and antidiagonal.
0

%I #3 Mar 31 2012 12:35:07

%S 1,4,64,832,43264,1827904,308948224,42427198528,23308417310464,

%T 10404188730539968,18578639958381807616,26955458921407543923136,

%U 156455150623383016555451392

%N 1/5 of the number of 5-colorings of an n X n array symmetric about both diagonal and antidiagonal.

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 05 2008