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 A302308 #4 Apr 05 2018 09:37:53 %S A302308 21,363,275,2048,4772,18992,76642,364922,1991487,11850372,74391348, %T A302308 486418706,3257213385,22149432404,152046330078,1049873091893, %U A302308 7276150005243,50546516116050,351666937737820,2449012961612884 %N A302308 Number of nX7 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302308 Column 7 of A302309. %H A302308 R. H. Hardin, <a href="/A302308/b302308.txt">Table of n, a(n) for n = 1..210</a> %e A302308 Some solutions for n=5 %e A302308 ..0..1..0..1..0..0..0. .0..1..0..1..0..1..0. .0..1..0..1..1..1..0 %e A302308 ..0..1..0..1..0..1..0. .0..1..0..1..0..0..0. .0..0..0..1..0..1..0 %e A302308 ..0..1..0..1..0..1..0. .1..0..0..1..1..1..1. .1..1..1..1..1..0..1 %e A302308 ..0..1..0..1..0..1..1. .1..0..0..0..0..0..1. .1..0..1..1..0..0..0 %e A302308 ..0..1..0..1..0..1..0. .0..1..0..0..1..0..1. .1..0..0..0..0..0..1 %Y A302308 Cf. A302309. %K A302308 nonn %O A302308 1,1 %A A302308 _R. H. Hardin_, Apr 05 2018