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 A181034 #5 Jun 02 2025 03:12:04 %S A181034 1,8,99,2999,200798,30584687,10496827403,8147000813446, %T A181034 14279081380626859,56548869471250924613,505895767712482884973116, %U A181034 10224865987802162338842130221,466867871514396686081152537710131 %N A181034 Number of nX(n+3) binary matrices with no initial bit string in any row or column divisible by 4. %C A181034 Superdiagonal 3 of A181031 %H A181034 R. H. Hardin, <a href="/A181034/b181034.txt">Table of n, a(n) for n=1..22</a> %e A181034 Some solutions for 4X7 %e A181034 ..1..1..1..1..1..1..1....1..1..1..1..1..1..1....1..1..1..1..1..1..1 %e A181034 ..1..0..1..0..1..0..1....1..0..1..0..1..0..1....1..0..1..0..1..0..1 %e A181034 ..1..1..0..1..0..1..0....1..1..0..1..0..1..0....1..1..0..1..0..1..0 %e A181034 ..1..0..1..0..1..0..1....1..0..1..0..1..1..1....1..0..1..1..1..0..1 %K A181034 nonn %O A181034 1,2 %A A181034 _R. H. Hardin_ Sep 30 2010