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1/9 of the number of 9-colorings of an n X n array symmetric about both diagonal and antidiagonal.
0

%I #3 Mar 31 2012 12:35:08

%S 1,8,512,29184,13307904,5404672512,17559792635904,50811763602977280,

%T 1176249454737889112064,24250990871047073899451904,

%U 3999906334177619217671691141120

%N 1/9 of the number of 9-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