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Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45.
0

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

%S 2,12,390,12963,1881506,1336889688,9293294524192,249490585063875516

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45.

%K nonn

%O 2,1

%A _R. H. Hardin_ Feb 09 2009