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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.

A199244 Number of nX6 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 A199244 #6 Jul 22 2025 13:15:41
%S A199244 5,39,472,7100,106134,1682457,27337776,454364514,7678775057,
%T A199244 131559174015,2279099028427
%N A199244 Number of nX6 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 A199244 Column 6 of A199246
%e A199244 Some solutions for n=4
%e A199244 ..0..1..2..1..2..1....0..1..0..2..1..1....0..1..2..1..0..0....0..1..2..1..2..1
%e A199244 ..2..0..1..2..1..2....1..0..1..0..1..1....2..2..1..2..0..0....1..0..1..0..1..2
%e A199244 ..0..1..2..1..0..0....2..2..0..2..0..2....2..2..0..1..2..1....0..2..0..1..2..0
%e A199244 ..1..2..0..2..0..0....2..2..1..0..2..0....1..0..1..2..1..0....2..0..1..2..0..2
%K A199244 nonn
%O A199244 1,1
%A A199244 _R. H. Hardin_ Nov 04 2011

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