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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.

A183303 Half the number of n X n binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors.

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%I A183303 #8 Jul 22 2025 08:47:43
%S A183303 1,3,9,55,910,29400,2160250,348871589,124597748299,98443712937832,
%T A183303 171962948531581497,664040284641624620852,5667787901436816984441067
%N A183303 Half the number of n X n binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors.
%C A183303 Diagonal of A183312
%e A183303 Some solutions with a(1,1)=0 for 5X5
%e A183303 ..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..0..1
%e A183303 ..0..1..0..1..0....0..1..0..0..1....0..1..0..0..1....1..0..1..1..0
%e A183303 ..1..1..0..0..1....1..0..1..0..1....1..0..1..0..1....0..1..1..0..1
%e A183303 ..0..0..1..1..0....0..0..1..1..0....1..0..1..1..0....0..1..0..1..0
%e A183303 ..1..0..1..0..1....1..1..0..1..0....0..1..0..0..1....1..0..1..0..1
%K A183303 nonn
%O A183303 1,2
%A A183303 _R. H. Hardin_ Jan 03 2011

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