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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.

A231218 Number of (n+1)X(7+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order.

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%I A231218 #6 Jul 23 2025 06:18:44
%S A231218 87,1098,34609,969461,28439115,820418528,23748656906,685733582035,
%T A231218 19812622781057,572302029497356,16533962109257389,477663753823928105,
%U A231218 13800046313373114629,398691931165963350492,11518505348614958772694
%N A231218 Number of (n+1)X(7+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order.
%C A231218 Column 7 of A231219
%H A231218 R. H. Hardin, <a href="/A231218/b231218.txt">Table of n, a(n) for n = 1..18</a>
%e A231218 Some solutions for n=4
%e A231218 ..0..0..0..0..0..1..1..1....0..0..0..0..0..0..1..1....0..0..0..0..0..0..1..1
%e A231218 ..0..0..0..0..0..1..0..0....0..0..2..2..0..0..1..1....0..0..0..0..0..0..1..1
%e A231218 ..1..1..0..0..0..1..0..0....0..0..2..2..1..1..1..1....1..1..1..1..1..1..2..2
%e A231218 ..1..1..0..0..1..1..2..2....1..1..2..2..1..0..0..1....1..0..0..1..1..1..2..2
%e A231218 ..0..0..0..0..1..1..2..2....1..1..1..1..1..0..0..1....1..0..0..1..1..1..2..2
%K A231218 nonn
%O A231218 1,1
%A A231218 _R. H. Hardin_, Nov 05 2013

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