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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.

A205413 Number of (n+2)X8 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..2 introduced in row major order.

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%I A205413 #6 Jul 22 2025 18:50:56
%S A205413 14452683,768581101,45661264026,1715387177450,98445276297551
%N A205413 Number of (n+2)X8 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..2 introduced in row major order.
%C A205413 Column 6 of A205415
%e A205413 Some solutions for n=3
%e A205413 ..0..0..0..0..0..0..0..0....0..1..1..0..2..1..0..1....0..0..0..0..1..2..2..1
%e A205413 ..0..0..0..0..0..1..0..1....0..1..0..1..2..1..0..2....0..2..0..0..1..2..2..0
%e A205413 ..1..1..2..1..1..1..0..2....0..1..1..1..1..1..1..1....0..1..1..1..1..1..2..2
%e A205413 ..2..2..2..2..2..1..0..2....0..0..0..0..0..0..0..0....0..0..0..0..1..0..2..2
%e A205413 ..2..1..2..0..0..1..1..1....0..0..2..2..0..1..2..0....2..1..0..2..1..0..2..2
%K A205413 nonn
%O A205413 1,1
%A A205413 _R. H. Hardin_ Jan 26 2012

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