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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.

A267637 Number of n X n 0..1 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.

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%I A267637 #6 Apr 20 2020 19:45:19
%S A267637 1,8,51,1015,8917,343145,3696933,330654951,4301737251,1093232460925
%N A267637 Number of n X n 0..1 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.
%C A267637 Diagonal of A267644.
%e A267637 Some solutions for n=5
%e A267637 ..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..1..0..1
%e A267637 ..1..0..1..0..0....0..1..1..0..0....1..0..0..1..1....1..0..1..0..1
%e A267637 ..1..0..0..1..1....1..0..1..0..1....0..1..1..0..0....0..1..0..1..0
%e A267637 ..0..1..0..0..1....0..1..0..1..1....0..1..0..0..1....1..0..1..1..0
%e A267637 ..1..0..1..0..0....1..0..1..1..0....1..0..1..1..0....1..1..0..0..1
%Y A267637 Cf. A267644.
%K A267637 nonn
%O A267637 1,2
%A A267637 _R. H. Hardin_, Jan 18 2016

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