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 A262471 #4 Sep 23 2015 18:51:34 %S A262471 1,86,7396,107731,2924245,194647694,15659602612,997197229531, %T A262471 73403875498285,5949800358307070,491379103358093140, %U A262471 40436885956386358531,3371777492321746335493,284471978025689266803566 %N A262471 Number of (n+1)X(7+1) 0..1 arrays with each row divisible by 3 and each column divisible by 5, read as a binary number with top and left being the most significant bits. %C A262471 Column 7 of A262472. %H A262471 R. H. Hardin, <a href="/A262471/b262471.txt">Table of n, a(n) for n = 1..57</a> %e A262471 Some solutions for n=4 %e A262471 ..0..1..1..0..1..0..0..1....0..1..0..0..0..0..1..0....0..0..0..0..1..1..1..1 %e A262471 ..0..0..1..1..1..0..0..1....0..1..1..0..0..0..0..0....1..0..1..0..1..0..1..1 %e A262471 ..1..1..1..0..0..1..0..0....1..1..0..1..1..0..1..1....1..1..0..0..1..1..1..1 %e A262471 ..0..0..1..1..0..0..0..0....0..1..1..0..0..0..0..0....1..0..1..0..1..0..1..1 %e A262471 ..1..0..0..0..1..1..0..1....1..0..0..1..1..0..0..1....1..1..0..0..0..0..0..0 %Y A262471 Cf. A262472. %K A262471 nonn %O A262471 1,2 %A A262471 _R. H. Hardin_, Sep 23 2015