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 A189909 #6 Jul 22 2025 11:56:35 %S A189909 96,9216,884736,36890502,1518596226,63149685928,2662054379066, %T A189909 111638761715758,4622530935507966,190665313953931062, %U A189909 7834025420282521194,321059587185451853573 %N A189909 Number of 7Xn binary arrays without the pattern 0 0 1 1 diagonally, vertically, antidiagonally or horizontally. %C A189909 Row 7 of A189905 %e A189909 Some solutions for 7X4 %e A189909 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0 %e A189909 ..0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..0....0..0..0..1 %e A189909 ..0..0..0..0....1..0..0..0....1..1..0..0....0..1..1..1....1..0..1..1 %e A189909 ..0..1..1..1....0..0..0..1....0..0..1..0....0..0..0..0....0..1..0..0 %e A189909 ..0..0..0..0....0..0..0..1....0..1..0..0....0..1..1..0....1..0..0..0 %e A189909 ..0..1..0..1....0..0..0..1....1..0..1..1....0..1..1..0....0..0..1..0 %e A189909 ..1..1..0..0....0..1..1..0....0..1..0..0....1..0..1..1....1..1..0..0 %K A189909 nonn %O A189909 1,1 %A A189909 _R. H. Hardin_ May 01 2011