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 A206698 #7 Jul 22 2025 19:37:31 %S A206698 622,386884,192513201,94853765621,46260684361347,22540704363210913, %T A206698 10977508218092030949,5345785254841179750528, %U A206698 2603202653456919727333824,1267659520116049754553214784,617300558095977800421783249695 %N A206698 Number of nX6 0..2 arrays avoiding the pattern z-2 z-1 z in any row or column. %C A206698 Column 6 of A206700 %H A206698 R. H. Hardin, <a href="/A206698/b206698.txt">Table of n, a(n) for n = 1..210</a> %e A206698 Some solutions for n=4 %e A206698 ..2..0..2..1..1..1....2..2..2..1..2..1....1..2..1..1..1..1....1..0..2..0..1..0 %e A206698 ..1..0..0..1..0..2....0..2..2..0..0..2....0..2..2..1..2..1....0..0..2..1..0..0 %e A206698 ..0..0..0..2..0..2....1..0..1..0..0..2....2..2..1..2..1..1....2..0..0..0..2..0 %e A206698 ..2..0..1..0..0..0....0..2..2..2..0..2....0..2..1..2..2..2....0..1..1..1..0..1 %K A206698 nonn %O A206698 1,1 %A A206698 _R. H. Hardin_ Feb 11 2012