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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.

A199243 Number of nX5 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

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%I A199243 #6 Jul 22 2025 13:15:34
%S A199243 6,36,110,2907,29227,106134,3190670,34188947,128653588,4104988637,
%T A199243 45715625760,175247135865,5792733542191,65791526001202,
%U A199243 255708129900506,8623880506094423
%N A199243 Number of nX5 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.
%C A199243 Column 5 of A199246
%e A199243 Some solutions for n=4
%e A199243 ..0..1..0..2..1....0..1..0..2..1....0..1..2..0..1....0..1..2..0..1
%e A199243 ..1..0..2..0..2....1..2..1..0..2....1..2..0..2..0....1..2..0..2..0
%e A199243 ..2..1..0..2..0....2..1..0..2..0....2..0..2..1..1....0..1..2..0..1
%e A199243 ..1..2..1..0..2....1..2..1..0..2....0..2..0..1..1....1..2..0..1..2
%K A199243 nonn
%O A199243 1,1
%A A199243 _R. H. Hardin_ Nov 04 2011

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