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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.

A204683 Number of nX6 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 A204683 #7 Jul 22 2025 18:13:59
%S A204683 143,447343,563046972,815364171994,1155411237719424
%N A204683 Number of nX6 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 A204683 Column 6 of A204685
%e A204683 Some solutions for n=5
%e A204683 ..0..0..1..1..2..2....0..0..1..0..0..2....0..0..1..0..0..1....0..1..0..0..2..2
%e A204683 ..0..1..3..1..3..1....1..1..0..0..3..1....1..2..1..0..1..3....0..2..3..3..0..1
%e A204683 ..2..3..2..2..3..2....3..1..3..1..3..2....1..3..3..2..0..1....2..3..2..3..1..1
%e A204683 ..0..2..1..1..2..1....2..2..3..3..2..0....0..0..1..1..3..3....1..3..3..0..1..3
%e A204683 ..3..2..3..1..0..0....1..0..0..3..1..3....0..3..1..1..3..2....1..0..3..0..2..1
%K A204683 nonn
%O A204683 1,1
%A A204683 _R. H. Hardin_ Jan 18 2012

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