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

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

%S 1,64,29184,94818816,2194974079488,362034059960871936,

%T 425455980192553057625088,3562419025470409266468883742208,

%U 212530144659518720790378044762226342912

%N 1/9 of the number of 9-colorings of an n X n array symmetric about main diagonal.

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 05 2008