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 A189907 #7 Jul 22 2025 11:56:21 %S A189907 28,784,21952,377517,6442436,109264923,1841998924,30880712109, %T A189907 513953862828,8524935994485,141100741163866,2331559436006836, %U A189907 38495167111404534,635205147205219239,10477659617370128080 %N A189907 Number of 5Xn binary arrays without the pattern 0 0 1 1 diagonally, vertically, antidiagonally or horizontally. %C A189907 Row 5 of A189905 %H A189907 R. H. Hardin, <a href="/A189907/b189907.txt">Table of n, a(n) for n = 1..200</a> %e A189907 Some solutions for 5X4 %e A189907 ..0..0..0..0....0..0..0..0....0..1..0..1....0..1..0..0....0..1..0..1 %e A189907 ..1..0..0..1....1..0..1..1....1..0..1..0....1..0..0..1....1..1..0..0 %e A189907 ..1..0..1..0....0..1..0..1....1..1..0..1....0..0..0..0....0..1..0..0 %e A189907 ..0..0..0..0....0..0..1..0....0..0..0..1....0..1..0..0....1..0..0..1 %e A189907 ..1..0..1..0....0..0..0..0....1..0..1..1....1..0..0..0....1..0..0..0 %K A189907 nonn %O A189907 1,1 %A A189907 _R. H. Hardin_ May 01 2011