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 A229410 #6 Jul 23 2025 05:43:32 %S A229410 3105,2127718,1519840402,1088122273732,777638567093963, %T A229410 555943964324988272,397464769862060665547,284105148255669874762809, %U A229410 203090587265539495545226411,145172630350979718652322109853 %N A229410 Number of nX6 0..3 arrays avoiding 11 horizontally, 22 vertically, 33 antidiagonally and 00 diagonally. %C A229410 Column 6 of A229412 %H A229410 R. H. Hardin, <a href="/A229410/b229410.txt">Table of n, a(n) for n = 1..210</a> %e A229410 Some solutions for n=3 %e A229410 ..0..0..0..0..2..3....0..0..0..0..1..0....0..0..0..0..1..0....0..0..0..0..0..0 %e A229410 ..0..2..1..2..1..0....0..2..1..2..1..2....0..2..1..2..1..2....0..2..1..3..1..3 %e A229410 ..1..3..0..1..3..2....0..3..0..1..0..0....2..1..0..1..0..0....0..1..0..3..0..2 %K A229410 nonn %O A229410 1,1 %A A229410 _R. H. Hardin_ Sep 22 2013