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 A188520 #7 Jul 22 2025 11:15:15 %S A188520 33,1089,16438,231400,2800798,32470385,359696109,3903047802, %T A188520 41642655120,440047202716,4617244898772,48229127405889, %U A188520 502163657044635,5217313950984361,54124162283409093,560894846117339319 %N A188520 Number of nX6 binary arrays without the pattern 1 1 0 diagonally, vertically or horizontally. %C A188520 Column 6 of A188523 %H A188520 R. H. Hardin, <a href="/A188520/b188520.txt">Table of n, a(n) for n = 1..200</a> %e A188520 Some solutions for 3X6 %e A188520 ..0..0..0..1..0..0....0..0..1..0..0..1....1..0..0..1..0..1....0..0..0..0..0..0 %e A188520 ..1..0..1..0..0..1....0..0..1..1..1..1....1..0..0..0..0..1....0..1..0..0..1..1 %e A188520 ..1..0..1..0..1..0....0..0..1..1..1..1....1..1..1..1..1..1....0..1..0..1..0..0 %K A188520 nonn %O A188520 1,1 %A A188520 _R. H. Hardin_ Apr 02 2011