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A156387 Number of 5X5 arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to n. 0

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

%S 1,2,0,0,5,3,0,0,2,4,0,0,0,4,0,0,7,4,0,0,7,0,0,0,0,8,0,0,0,10,0,0,6,0,

%T 0,0,15,6,0,0,6,6,0,0,0,11,0,0,0,6,0,0,10,14,0,0,0,0,0,0,0,10,0,0,7,

%U 12,0,0,28,0,0,0,10,6,0,0,0,6,0,0,17,12,0,0,0,16,0,0,0,14,0,0,0,0,0,0,0,6,0,0

%N Number of 5X5 arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to n.

%e All solutions for n=4

%e ...0.0.0.4.0...0.4.0.0.0...1.0.1.1.1...1.1.0.1.1...1.1.1.0.1

%e ...4.0.0.0.0...0.0.0.0.4...1.1.1.1.0...1.1.0.1.1...0.1.1.1.1

%e ...0.0.4.0.0...0.0.4.0.0...1.1.0.1.1...0.0.4.0.0...1.1.0.1.1

%e ...0.0.0.0.4...4.0.0.0.0...0.1.1.1.1...1.1.0.1.1...1.1.1.1.0

%e ...0.4.0.0.0...0.0.0.4.0...1.1.1.0.1...1.1.0.1.1...1.0.1.1.1

%K nonn

%O 0,2

%A _R. H. Hardin_ Feb 09 2009

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Last modified August 26 19:35 EDT 2024. Contains 375462 sequences. (Running on oeis4.)