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A203494 Number of 4Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns.

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%I A203494 #6 Jul 22 2025 17:17:42
%S A203494 3,82,3760,173860,8518564,442135180,24148894412
%N A203494 Number of 4Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns.
%C A203494 Row 4 of A203491
%e A203494 Some solutions for n=5
%e A203494 ..2..1..0..0..2....1..2..2..0..0....0..1..2..1..2....1..2..1..1..0
%e A203494 ..0..0..2..1..2....1..1..2..0..1....1..2..1..0..2....1..2..0..1..1
%e A203494 ..1..1..1..1..1....2..1..2..0..0....1..1..1..2..1....2..0..2..0..1
%e A203494 ..0..2..2..0..1....0..2..2..0..1....1..2..1..1..1....2..0..2..1..0
%K A203494 nonn
%O A203494 1,1
%A A203494 _R. H. Hardin_ Jan 02 2012

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