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 A189903 #7 Jul 22 2025 11:55:52 %S A189903 96,9216,884736,39048081,1841998924,73093919926,2662054379066, %T A189903 94632691298302,3195656417625712,106562344127343098, %U A189903 3486148871895147896,112963121516301689241,3635916169412490099632,116375651934670010881664 %N A189903 Number of nX7 binary arrays without the pattern 0 0 1 1 diagonally, vertically, antidiagonally or horizontally. %C A189903 Column 7 of A189905 %H A189903 R. H. Hardin, <a href="/A189903/b189903.txt">Table of n, a(n) for n = 1..34</a> %e A189903 Some solutions for 4X7 %e A189903 ..0..0..0..0..1..0..0....0..0..0..1..0..0..0....0..0..1..0..1..1..0 %e A189903 ..0..1..0..0..1..0..1....0..1..1..0..1..0..0....0..0..1..0..1..0..1 %e A189903 ..0..1..0..1..1..0..1....0..0..0..0..0..1..0....0..0..0..0..0..1..0 %e A189903 ..0..0..0..0..0..0..1....0..0..1..0..0..0..0....0..0..1..0..1..1..0 %K A189903 nonn %O A189903 1,1 %A A189903 _R. H. Hardin_ May 01 2011