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 A188756 #10 Jul 22 2025 11:21:00 %S A188756 2,16,240,8024,532168,75643222,23051042448,15452387615952, %T A188756 22950235913333896,76154002726353974190,566628641478740667189960, %U A188756 9481314346965748016023712242,357341446119863197891865122035480 %N A188756 Number of n X n binary arrays without the pattern 0 0 1 vertically or horizontally. %C A188756 Diagonal of A188763 %H A188756 R. H. Hardin, <a href="/A188756/b188756.txt">Table of n, a(n) for n = 1..14</a> %e A188756 Some solutions for 3X3 %e A188756 ..1..1..1....1..1..1....1..0..0....0..0..0....1..1..0....0..1..0....1..0..0 %e A188756 ..0..1..1....0..0..0....0..1..1....1..1..0....0..1..0....1..1..0....1..1..1 %e A188756 ..0..1..0....0..0..0....1..0..0....1..0..0....0..0..0....0..1..0....1..0..0 %K A188756 nonn %O A188756 1,1 %A A188756 _R. H. Hardin_ Apr 09 2011