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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.

A205582 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the same number of equal edges as its horizontal or vertical neighbors, and new values 0..2 introduced in row major order.

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%I A205582 #7 Jul 22 2025 18:56:18
%S A205582 14,550,48401,8952876,3619876639,3232900348158
%N A205582 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the same number of equal edges as its horizontal or vertical neighbors, and new values 0..2 introduced in row major order.
%C A205582 Diagonal of A205590
%e A205582 Some solutions for n=4
%e A205582 ..0..1..0..0..2....0..1..1..0..2....0..0..1..1..2....0..0..0..0..0
%e A205582 ..0..0..2..1..0....1..2..2..2..2....0..1..2..1..0....1..0..0..2..1
%e A205582 ..0..0..0..2..2....1..1..0..2..2....2..1..1..0..0....2..1..0..1..0
%e A205582 ..1..1..2..2..2....0..2..1..1..1....0..2..0..0..0....1..1..2..0..0
%e A205582 ..2..0..1..0..0....1..0..0..1..1....0..0..1..2..2....1..1..1..0..0
%K A205582 nonn
%O A205582 1,1
%A A205582 _R. H. Hardin_ Jan 29 2012

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