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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.

A204677 Number of n X n 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order.

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%I A204677 #9 Sep 03 2022 23:18:20
%S A204677 1,15,6451,40919141,2579588216958
%N A204677 Number of n X n 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order.
%C A204677 Diagonal of A204685.
%e A204677 Some solutions for n=5
%e A204677 ..0..1..1..0..2....0..0..1..1..0....0..0..1..0..2....0..0..1..0..0
%e A204677 ..2..3..1..3..3....2..0..3..3..0....2..1..1..3..2....0..2..3..1..1
%e A204677 ..0..0..3..2..3....2..3..1..0..3....0..1..0..3..3....2..0..1..0..0
%e A204677 ..3..2..0..1..2....0..3..2..1..0....2..2..3..2..0....0..0..3..0..1
%e A204677 ..0..3..3..1..2....2..2..3..0..0....1..0..3..3..2....1..2..1..3..2
%Y A204677 Cf. A204685.
%K A204677 nonn
%O A204677 1,2
%A A204677 _R. H. Hardin_, Jan 18 2012

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