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 A189157 #7 Jul 28 2022 21:53:16 %S A189157 28,784,21952,424401,8210464,151889331,2710884810,48083827685, %T A189157 844714479714,14772128520081,257802672361640,4491710608316816, %U A189157 78198928468727304,1360792591701114315,23673324742422186018 %N A189157 Number of n X 5 binary arrays without the pattern 0 0 1 1 diagonally, vertically or horizontally. %C A189157 Column 5 of A189161. %H A189157 R. H. Hardin, <a href="/A189157/b189157.txt">Table of n, a(n) for n = 1..200</a> %e A189157 Some solutions for 4 X 5 %e A189157 ..0..1..0..1..0....0..0..1..0..1....0..1..0..0..1....0..0..0..0..1 %e A189157 ..0..0..1..0..0....1..0..1..0..1....1..1..1..1..1....1..1..1..0..0 %e A189157 ..0..1..0..0..1....0..0..1..0..1....0..1..1..0..1....0..1..0..1..1 %e A189157 ..1..1..1..0..0....0..1..0..0..0....0..1..1..0..0....1..1..0..0..1 %Y A189157 Cf. A189161. %K A189157 nonn %O A189157 1,1 %A A189157 _R. H. Hardin_, Apr 17 2011