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 A229370 #6 Jul 23 2025 05:41:16 %S A229370 448,19675,1067299,56939585,3043629267,162794962814,8710922742428, %T A229370 465220677212678,24888824486410340,1329636795738857739, %U A229370 71103770288879123298,3799851842800067248447,203151084678069461627099 %N A229370 Number of nX6 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 antidiagonally. %C A229370 Column 6 of A229372 %H A229370 R. H. Hardin, <a href="/A229370/b229370.txt">Table of n, a(n) for n = 1..220</a> %e A229370 Some solutions for n=3 %e A229370 ..0..0..1..2..0..0....0..0..0..0..0..2....0..0..0..2..0..1....0..0..1..2..1..2 %e A229370 ..1..0..2..1..2..0....1..2..1..2..1..0....1..2..2..1..2..1....2..2..0..0..0..0 %e A229370 ..1..0..1..2..1..2....0..1..0..1..2..0....0..0..0..2..1..2....0..1..2..2..2..2 %K A229370 nonn %O A229370 1,1 %A A229370 _R. H. Hardin_ Sep 21 2013