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Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 5.
0

%I #4 Dec 18 2015 18:17:16

%S 2,0,22,7,232,270,9312,40416,1578064,10491480,534495232,4186295040,

%T 266388662656,2380048630848,182963339479264,1839487795001024,

%U 166774503916789696,1865501254974930048,195842622547532763968

%N Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 5.

%K nonn

%O 2,1

%A _R. H. Hardin_ Feb 09 2009