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.
%I A204703 #8 Jul 22 2025 18:14:48 %S A204703 82,40344,5767683,1074195735,192759130113,34925753412578, %T A204703 6319625580942184,1144097011453760287,207096410275997210933, %U A204703 37489155843579834602268,6786272895764958062549631 %N A204703 Number of nX6 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 A204703 Column 6 of A204705 %H A204703 R. H. Hardin, <a href="/A204703/b204703.txt">Table of n, a(n) for n = 1..47</a> %e A204703 Some solutions for n=5 %e A204703 ..0..1..0..0..1..0....0..0..1..2..0..2....0..0..1..2..0..1....0..0..1..2..2..0 %e A204703 ..0..0..1..2..2..0....1..0..2..1..2..1....0..2..2..1..1..2....1..0..0..1..2..1 %e A204703 ..2..1..1..2..0..1....2..2..1..2..0..0....2..1..2..0..2..1....0..1..1..2..0..0 %e A204703 ..2..2..0..1..2..2....2..2..0..0..1..1....2..1..1..0..1..2....0..0..2..1..0..2 %e A204703 ..1..0..0..1..2..0....0..0..1..2..0..2....0..2..1..2..0..2....1..1..2..0..2..2 %K A204703 nonn %O A204703 1,1 %A A204703 _R. H. Hardin_ Jan 18 2012