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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.

A204698 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order.

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%I A204698 #9 Jul 22 2025 18:14:21
%S A204698 1,14,1417,835135,2389914827,34925753412578,2568926644225402978,
%T A204698 954699753721419299486986
%N A204698 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order.
%C A204698 Diagonal of A204705
%e A204698 Some solutions for n=5
%e A204698 ..0..0..1..2..0....0..0..1..2..0....0..0..1..2..2....0..1..0..2..1
%e A204698 ..1..1..2..0..2....1..2..1..2..1....2..2..1..1..2....2..2..1..1..0
%e A204698 ..2..2..1..2..2....2..1..0..0..1....1..0..0..1..0....1..1..0..0..2
%e A204698 ..2..1..0..0..1....1..1..2..1..2....1..1..2..0..2....0..0..2..0..0
%e A204698 ..0..1..0..1..0....2..2..1..1..0....2..2..0..1..1....0..1..2..1..1
%K A204698 nonn
%O A204698 1,2
%A A204698 _R. H. Hardin_ Jan 18 2012

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