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 A188985 #9 Jul 22 2025 11:30:38 %S A188985 2,16,295,10812,852448,144733702,55080396536,46897992282392, %T A188985 90347796732080200,391616769266718212264,3836378499038367303867568, %U A188985 84709934712009857654653118434,4225407805631534612606491862152228 %N A188985 Number of n X n binary arrays without the pattern 0 0 1 antidiagonally or horizontally. %C A188985 Diagonal of A188992 %H A188985 R. H. Hardin, <a href="/A188985/b188985.txt">Table of n, a(n) for n = 1..18</a> %e A188985 Some solutions for 3X3 %e A188985 ..1..0..1....0..1..1....1..0..0....1..1..1....1..0..1....0..1..1....0..1..1 %e A188985 ..1..0..1....1..1..0....1..1..0....1..0..1....0..1..0....0..1..1....0..0..0 %e A188985 ..0..1..0....0..1..1....1..0..0....0..1..0....1..0..1....1..1..0....0..0..0 %K A188985 nonn %O A188985 1,1 %A A188985 _R. H. Hardin_ Apr 15 2011