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 A181032 #5 Jun 02 2025 03:11:50 %S A181032 1,3,17,227,6743,454385,69050253,23720149995,18403310404291, %T A181032 32260116141540213,127750070550172845235,1142905840646183024996181, %U A181032 23099457587377397021217958619,1054727887880873003123899368746005 %N A181032 Number of nX(n+1) binary matrices with no initial bit string in any row or column divisible by 4. %C A181032 Superdiagonal 1 of A181031 %H A181032 R. H. Hardin, <a href="/A181032/b181032.txt">Table of n, a(n) for n=1..22</a> %e A181032 Some solutions for 4X5 %e A181032 ..1..1..1..1..1....1..1..1..1..1....1..1..1..1..1....1..1..1..1..1 %e A181032 ..1..0..1..0..1....1..0..1..0..1....1..0..1..0..1....1..0..1..0..1 %e A181032 ..1..1..0..1..0....1..1..0..1..0....1..1..0..1..0....1..1..0..1..0 %e A181032 ..1..0..1..0..1....1..0..1..1..1....1..1..1..0..1....1..1..1..1..1 %K A181032 nonn %O A181032 1,2 %A A181032 _R. H. Hardin_ Sep 30 2010