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 A301667 #4 Mar 25 2018 11:37:01 %S A301667 5,162,1498,14394,146841,1537496,15498505,159497778,1631501428, %T A301667 16710326446,171088097185,1752145711420,17940714321741, %U A301667 183715971451846,1881222389643034,19263608263871012,197257711048154849 %N A301667 Number of nX6 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero. %C A301667 Column 6 of A301669. %H A301667 R. H. Hardin, <a href="/A301667/b301667.txt">Table of n, a(n) for n = 1..210</a> %e A301667 Some solutions for n=5 %e A301667 ..0..1..1..0..1..1. .0..1..1..1..0..0. .0..0..0..1..1..1. .0..1..1..1..0..0 %e A301667 ..0..1..0..0..0..1. .0..1..0..0..1..0. .0..1..0..1..0..0. .0..1..0..0..0..0 %e A301667 ..1..1..0..0..0..1. .0..1..0..1..1..1. .1..1..0..0..1..0. .0..0..1..1..0..1 %e A301667 ..0..0..1..0..1..0. .1..0..0..1..1..0. .1..0..1..0..1..0. .1..0..1..1..0..1 %e A301667 ..1..1..1..0..1..0. .1..1..1..0..0..0. .1..0..1..0..0..0. .1..0..0..0..1..1 %Y A301667 Cf. A301669. %K A301667 nonn %O A301667 1,1 %A A301667 _R. H. Hardin_, Mar 25 2018