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A229416 Number of n X n 0..3 zero-diagonal arrays with corresponding row and column sums equal.

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%I A229416 #6 Jul 23 2025 05:43:59
%S A229416 1,4,136,59008,345706336,28256240134144,33097994593655140864
%N A229416 Number of n X n 0..3 zero-diagonal arrays with corresponding row and column sums equal.
%C A229416 Column 3 of A229417
%e A229416 Some solutions for n=4
%e A229416 ..0..2..3..3....0..0..0..1....0..1..2..0....0..3..2..0....0..3..0..1
%e A229416 ..3..0..3..0....0..0..0..1....0..0..3..3....2..0..2..3....1..0..2..2
%e A229416 ..2..3..0..3....0..0..0..3....3..2..0..3....0..2..0..3....3..0..0..1
%e A229416 ..3..1..2..0....1..1..3..0....0..3..3..0....3..2..1..0....0..2..2..0
%K A229416 nonn
%O A229416 1,2
%A A229416 _R. H. Hardin_ Sep 22 2013

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