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 A188989 #7 Jul 22 2025 11:30:45 %S A188989 33,1089,21952,423606,7844188,144733702,2668260348,49183191266, %T A188989 906546313088,16709359181770,307984617365928,5676728147678902, %U A188989 104632630902956668,1928573464163110638,35547186061830482980 %N A188989 Number of nX6 binary arrays without the pattern 0 0 1 antidiagonally or horizontally. %C A188989 Column 6 of A188992 %H A188989 R. H. Hardin, <a href="/A188989/b188989.txt">Table of n, a(n) for n = 1..200</a> %F A188989 Empirical: a(n) = 22*a(n-1) -47*a(n-2) -420*a(n-3) +1353*a(n-4) +490*a(n-5) -5593*a(n-6) +15840*a(n-7) -27360*a(n-8) +19496*a(n-9) -1828*a(n-10) -1376*a(n-11) -576*a(n-12) for n>14 %e A188989 Some solutions for 3X6 %e A188989 ..0..1..1..0..1..1....1..1..0..1..0..1....1..1..1..1..0..1....1..0..1..1..0..0 %e A188989 ..1..1..1..1..1..0....0..1..0..1..0..0....1..1..1..0..1..0....1..0..1..1..1..1 %e A188989 ..0..1..0..1..1..1....0..1..0..1..1..1....1..1..0..1..0..1....1..0..1..0..0..0 %K A188989 nonn %O A188989 1,1 %A A188989 _R. H. Hardin_ Apr 15 2011