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 A300470 #4 Mar 06 2018 11:39:36 %S A300470 32,1490,31106,759100,18735889,462538206,11408562672,281433652906, %T A300470 6942908646999,171280218101813,4225436849045491,104240370076371736, %U A300470 2571581648449512936,63440223592452588279,1565053148367633815372 %N A300470 Number of nX6 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A300470 Column 6 of A300472. %H A300470 R. H. Hardin, <a href="/A300470/b300470.txt">Table of n, a(n) for n = 1..210</a> %e A300470 Some solutions for n=5 %e A300470 ..0..0..0..1..1..1. .0..0..0..0..1..1. .0..0..0..1..0..1. .0..0..0..1..0..1 %e A300470 ..0..1..0..0..0..1. .0..1..0..1..0..0. .0..1..0..1..1..0. .0..1..0..1..0..0 %e A300470 ..0..1..1..1..1..0. .0..0..1..0..1..0. .0..1..1..0..1..0. .0..0..1..0..1..0 %e A300470 ..0..0..1..0..1..0. .0..1..1..0..1..0. .0..0..1..1..0..1. .0..1..0..1..0..1 %e A300470 ..0..1..0..1..0..0. .0..0..0..0..1..0. .0..0..1..0..0..1. .0..0..0..0..1..1 %Y A300470 Cf. A300472. %K A300470 nonn %O A300470 1,1 %A A300470 _R. H. Hardin_, Mar 06 2018