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A156386 Number of 5X5 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n. 0

%I #3 Mar 31 2012 12:35:23

%S 1,6,12,12,13,7,32,0,18,68,32,48,12,12,36,0,19,76,112,76,75,20,40,0,

%T 64,112,88,204,0,38,76,0,30,184,168,116,275,18,80,0,114,194,96,204,48,

%U 99,136,0,12,210,272,452,190,86,472,0,156,256,128,400,0,126,152,0,19,316

%N Number of 5X5 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

%e All solutions for n=1

%e ...0.0.0.0.1...0.0.0.0.1...0.0.0.1.0...0.1.0.0.0...1.0.0.0.0...1.0.0.0.0

%e ...0.0.0.1.0...0.1.0.0.0...0.0.0.0.1...1.0.0.0.0...0.0.0.1.0...0.1.0.0.0

%e ...0.0.1.0.0...0.0.1.0.0...0.0.1.0.0...0.0.1.0.0...0.0.1.0.0...0.0.1.0.0

%e ...0.1.0.0.0...0.0.0.1.0...1.0.0.0.0...0.0.0.0.1...0.1.0.0.0...0.0.0.1.0

%e ...1.0.0.0.0...1.0.0.0.0...0.1.0.0.0...0.0.0.1.0...0.0.0.0.1...0.0.0.0.1

%K nonn

%O 0,2

%A _R. H. Hardin_ Feb 09 2009

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)