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 A262266 #4 Sep 17 2015 08:15:53 %S A262266 2,16,149,3253,828152,1002110608,3605017226155 %N A262266 Number of (n+2)X(n+2) 0..1 arrays with each row and column divisible by 5, read as a binary number with top and left being the most significant bits. %C A262266 Diagonal of A262274. %e A262266 Some solutions for n=4 %e A262266 ..0..1..1..0..0..1....0..0..1..0..1..0....0..1..0..1..0..0....0..0..1..0..1..0 %e A262266 ..1..1..1..1..0..0....0..1..0..1..0..0....0..1..0..1..0..0....0..0..0..0..0..0 %e A262266 ..1..0..1..1..0..1....0..0..0..1..0..1....1..0..1..0..0..0....0..1..1..1..1..0 %e A262266 ..0..1..1..1..1..0....0..1..0..1..0..0....0..1..0..1..0..0....1..1..0..1..1..1 %e A262266 ..0..1..0..1..0..0....0..0..1..1..1..1....1..1..1..1..0..0....0..1..0..1..0..0 %e A262266 ..1..1..0..0..1..0....0..0..1..0..1..0....0..1..0..1..0..0....1..1..0..1..1..1 %Y A262266 Cf. A262274. %K A262266 nonn %O A262266 1,1 %A A262266 _R. H. Hardin_, Sep 17 2015