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 A188855 #7 Jul 22 2025 11:25:45 %S A188855 33,1089,15358,181557,2092409,23131221,251306086,2684919693, %T A188855 28421978093,298598177550,3122369984285,32535214057086, %U A188855 338229518784097,3510243431140654,36388265576828423,376900796029916497 %N A188855 Number of 6Xn binary arrays without the pattern 0 0 1 vertically, antidiagonally or horizontally. %C A188855 Row 6 of A188851 %H A188855 R. H. Hardin, <a href="/A188855/b188855.txt">Table of n, a(n) for n = 1..200</a> %e A188855 Some solutions for 6X3 %e A188855 ..0..1..1....1..1..1....1..0..1....1..0..0....1..0..0....0..1..0....1..1..0 %e A188855 ..1..1..1....0..1..0....1..1..1....1..1..1....0..1..1....1..1..1....1..1..1 %e A188855 ..0..0..0....1..1..1....0..1..1....1..1..0....1..1..1....1..1..1....1..0..1 %e A188855 ..0..1..1....1..1..1....1..0..1....0..1..1....1..1..1....0..1..0....0..1..1 %e A188855 ..0..1..1....1..1..0....1..1..1....0..1..0....1..0..0....1..1..1....0..1..0 %e A188855 ..0..1..0....1..0..0....1..0..1....0..0..0....1..0..1....1..1..0....0..1..0 %K A188855 nonn %O A188855 1,1 %A A188855 _R. H. Hardin_ Apr 12 2011