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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.

A189899 Number of n X n binary arrays without the pattern 0 0 1 1 diagonally, vertically, antidiagonally or horizontally.

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%I A189899 #8 Jul 22 2025 11:55:31
%S A189899 2,16,512,35656,6442436,2719427244,2662054379066,6207537762978575
%N A189899 Number of n X n binary arrays without the pattern 0 0 1 1 diagonally, vertically, antidiagonally or horizontally.
%C A189899 Diagonal of A189905
%e A189899 Some solutions for 4X4
%e A189899 ..1..0..1..1....1..1..0..1....1..0..0..1....1..0..0..1....0..0..0..0
%e A189899 ..1..0..0..0....1..0..1..0....1..1..1..1....1..1..1..1....0..1..1..0
%e A189899 ..1..0..0..0....1..0..0..0....0..0..1..0....1..1..0..0....0..0..1..0
%e A189899 ..1..1..1..1....1..0..1..1....1..0..1..1....0..1..0..0....0..0..1..0
%K A189899 nonn
%O A189899 1,1
%A A189899 _R. H. Hardin_ May 01 2011

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