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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A202741 Number of n X 7 0..1 arrays with row sums equal and column sums unequal to adjacent columns.

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%I A202741 #6 Apr 11 2022 12:18:39
%S A202741 2,214,14258,613950,24620522,967878370,37121438930,1401569558590,
%T A202741 52383342552410,1938999772255314,71224141762895090
%N A202741 Number of n X 7 0..1 arrays with row sums equal and column sums unequal to adjacent columns.
%C A202741 Column 7 of A202742.
%e A202741 Some solutions for n=3
%e A202741 ..1..1..1..1..0..0..0....0..0..1..0..1..1..1....1..1..0..1..0..0..0
%e A202741 ..0..0..0..1..1..1..1....1..0..1..0..0..1..1....0..0..0..1..1..1..0
%e A202741 ..0..1..0..1..1..0..1....1..1..0..0..1..1..0....1..0..0..1..1..0..0
%Y A202741 Cf. A202742.
%K A202741 nonn
%O A202741 1,1
%A A202741 _R. H. Hardin_, Dec 23 2011

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