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 A189611 #8 Apr 26 2021 21:49:31 %S A189611 2,16,292,8496,532565,118571483,61652076124,52939317116118, %T A189611 90112326418652948,433430536108638364008,5597804841379220076966699 %N A189611 Number of n X n binary arrays without the pattern 0 1 0 diagonally, antidiagonally or horizontally. %C A189611 Diagonal of A189617. %e A189611 Some solutions for 3 X 3 %e A189611 ..1..0..0....1..0..0....1..0..0....0..0..1....1..0..1....0..1..1....1..1..1 %e A189611 ..0..0..1....0..0..0....0..0..0....0..1..1....0..1..1....1..1..1....1..0..1 %e A189611 ..0..0..0....1..1..0....0..1..1....1..0..1....0..0..0....1..1..1....0..0..0 %Y A189611 Cf. A189617. %K A189611 nonn %O A189611 1,1 %A A189611 _R. H. Hardin_ Apr 24 2011