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A159367 Number of n X n arrays of squares of integers summing to 7 1

%I

%S 4,540,18720,531300,8583300,86748088,623757696,3483871560,16023245700,

%T 63174296020,219752181792,688950636972,1978607887620,5271705817200,

%U 13162584962560,31050835145616,69671782148868,149524133455500

%N Number of n X n arrays of squares of integers summing to 7

%H R. H. Hardin, <a href="/A159367/b159367.txt">Table of n, a(n) for n=2..100</a>

%F Empirical: a(n)=n^2*(n-1)*(n+1)*(n^2-2)*(n^2-3)*(n^6-15*n^4+74*n^2+720)/5040. [From _R. J. Mathar_, Aug 11 2009]

%K nonn

%O 2,1

%A _R. H. Hardin_ Apr 11 2009

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Last modified June 25 15:29 EDT 2022. Contains 354851 sequences. (Running on oeis4.)