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 A262271 #4 Sep 17 2015 08:20:45 %S A262271 26,676,3639,37061,828152,20331508,411861253,9709537177,246785045498, %T A262271 6349411267540,161629359993567,4164579496141613,107965656860611016, %U A262271 2802803758993454068,72720752693665757869,1888876988979450269185 %N A262271 Number of (n+2)X(5+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 A262271 Column 5 of A262274. %H A262271 R. H. Hardin, <a href="/A262271/b262271.txt">Table of n, a(n) for n = 1..210</a> %e A262271 Some solutions for n=4 %e A262271 ..0..1..0..1..0..0..0....1..0..1..1..1..1..1....0..0..0..0..0..0..0 %e A262271 ..0..1..0..1..0..0..0....0..1..1..0..0..1..0....1..0..0..0..1..1..0 %e A262271 ..0..0..0..0..0..0..0....0..0..0..0..1..0..1....0..1..1..1..1..0..0 %e A262271 ..0..1..0..0..0..1..1....0..1..0..0..0..1..1....1..0..1..1..1..1..1 %e A262271 ..0..1..0..1..0..0..0....1..0..1..1..0..1..0....0..1..1..1..1..0..0 %e A262271 ..0..1..0..0..0..1..1....1..0..0..1..0..1..1....0..0..1..1..0..0..1 %Y A262271 Cf. A262274. %K A262271 nonn %O A262271 1,1 %A A262271 _R. H. Hardin_, Sep 17 2015