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 A189776 #7 Jul 22 2025 11:54:19 %S A189776 52,2704,140608,4461435,136521398,3848548036,112831587094, %T A189776 3292640179737,97500493294819,2875530570969513,84985322553211150, %U A189776 2506681235723278913,73977340086823664092,2182270990001902317787,64391876501073035366505 %N A189776 Number of nX6 binary arrays without the pattern 1 0 0 1 diagonally, vertically or horizontally. %C A189776 Column 6 of A189779 %H A189776 R. H. Hardin, <a href="/A189776/b189776.txt">Table of n, a(n) for n = 1..200</a> %e A189776 Some solutions for 5X6 %e A189776 ..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0 %e A189776 ..1..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0 %e A189776 ..0..1..0..0..0..0....0..1..0..0..0..0....0..1..0..1..0..0....0..0..1..0..0..0 %e A189776 ..0..0..1..1..0..0....0..1..1..0..0..0....1..0..1..1..0..0....0..1..0..0..0..0 %e A189776 ..0..0..0..1..0..0....1..1..1..1..0..1....1..1..1..1..0..0....1..1..1..1..1..1 %K A189776 nonn %O A189776 1,1 %A A189776 _R. H. Hardin_ Apr 27 2011