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 A181035 #5 Jun 02 2025 03:12:09 %S A181035 1,13,239,10897,1095851,250916131,129422885699,150985649174085, %T A181035 397743903151933881,2367568471466798904283,31835463913062005686452609, %U A181035 967121732734103600475330208107,66372797708066134019183673485369717 %N A181035 Number of nX(n+4) binary matrices with no initial bit string in any row or column divisible by 4. %C A181035 Superdiagonal 4 of A181031 %H A181035 R. H. Hardin, <a href="/A181035/b181035.txt">Table of n, a(n) for n=1..22</a> %e A181035 Some solutions for 4X8 %e A181035 ..1..1..1..1..1..1..1..1....1..1..1..1..1..1..1..1....1..1..1..1..1..1..1..1 %e A181035 ..1..0..1..0..1..0..1..0....1..0..1..0..1..0..1..0....1..0..1..0..1..0..1..0 %e A181035 ..1..1..0..1..0..1..0..1....1..1..0..1..0..1..0..1....1..1..0..1..0..1..0..1 %e A181035 ..1..0..1..0..1..0..1..0....1..0..1..0..1..0..1..1....1..0..1..0..1..1..1..0 %K A181035 nonn %O A181035 1,2 %A A181035 _R. H. Hardin_ Sep 30 2010