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A156475 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 21. 0

%I

%S 6,130,1872,121382,17647254,18669753424,68782403549580,

%T 503051985491086584

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 21.

%K nonn

%O 3,1

%A _R. H. Hardin_ Feb 09 2009

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Last modified June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)