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 A189060 #7 Jul 22 2025 11:31:53 %S A189060 21,441,6768,99721,1492864,22289912,333124565,4978704008,74410715409, %T A189060 1112149145053,16622281551532,248438608557405,3713193773280868, %U A189060 55497854913016132,829477855588392793,12397479511499889924 %N A189060 Number of nX5 binary arrays without the pattern 0 1 0 antidiagonally or horizontally. %C A189060 Column 5 of A189064 %H A189060 R. H. Hardin, <a href="/A189060/b189060.txt">Table of n, a(n) for n = 1..200</a> %F A189060 Empirical: a(n) = 21*a(n-1) -80*a(n-2) -240*a(n-3) +1115*a(n-4) +2917*a(n-5) -15840*a(n-6) +21676*a(n-7) -10784*a(n-8) +1216*a(n-9) for n>10 %e A189060 Some solutions for 3X5 %e A189060 ..0..1..1..1..0....1..1..0..0..0....0..0..0..1..1....0..0..0..0..1 %e A189060 ..1..1..1..1..1....1..1..1..1..0....0..0..1..1..0....1..1..0..1..1 %e A189060 ..0..1..1..1..1....1..1..1..0..0....1..0..1..1..1....1..1..0..0..1 %K A189060 nonn %O A189060 1,1 %A A189060 _R. H. Hardin_ Apr 16 2011