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 A303045 #4 Apr 17 2018 13:27:06 %S A303045 64,86,459,1686,9882,63254,345668,1853428,10924077,67726475,403669088, %T A303045 2380303051,14509938056,90934286594,564101640722,3472561956163, %U A303045 21698726671644,137462825832230,867471097889215,5452385965874930 %N A303045 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303045 Row 7 of A303040. %H A303045 R. H. Hardin, <a href="/A303045/b303045.txt">Table of n, a(n) for n = 1..210</a> %e A303045 Some solutions for n=5 %e A303045 ..0..1..0..0..0. .0..1..0..0..1. .0..1..0..1..0. .0..1..1..0..1 %e A303045 ..0..1..0..1..0. .1..1..0..1..0. .1..1..0..1..0. .0..1..0..1..1 %e A303045 ..1..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..0..0..1 %e A303045 ..1..1..1..1..0. .0..1..0..0..0. .0..0..0..1..0. .0..1..0..0..1 %e A303045 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0 %e A303045 ..1..1..1..1..1. .1..1..0..1..0. .0..1..1..1..0. .1..0..1..1..0 %e A303045 ..0..1..1..1..0. .0..1..0..0..1. .0..1..0..1..0. .1..0..1..0..1 %Y A303045 Cf. A303040. %K A303045 nonn %O A303045 1,1 %A A303045 _R. H. Hardin_, Apr 17 2018