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 A303530 #4 Apr 25 2018 12:44:41 %S A303530 64,86,687,4112,56046,965150,15768709,258412452,4730074082, %T A303530 89182240009,1607792486756,28651954738510,525363767853510, %U A303530 9705710828046354,176560700611952149,3198325214799036047,58453456076912623357 %N A303530 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303530 Row 7 of A303525. %H A303530 R. H. Hardin, <a href="/A303530/b303530.txt">Table of n, a(n) for n = 1..210</a> %e A303530 Some solutions for n=5 %e A303530 ..0..1..0..1..0. .0..1..0..0..1. .0..1..0..1..0. .0..1..0..0..0 %e A303530 ..1..1..0..1..0. .1..0..0..0..0. .0..1..1..0..0. .0..1..0..1..0 %e A303530 ..0..1..0..1..0. .0..0..1..0..1. .1..0..1..1..0. .0..1..0..1..0 %e A303530 ..0..0..0..1..0. .1..0..0..0..1. .1..0..1..1..0. .0..1..0..0..0 %e A303530 ..0..1..0..1..0. .0..0..0..0..0. .1..0..1..1..1. .1..1..0..1..0 %e A303530 ..0..1..1..1..0. .1..0..0..0..1. .1..0..1..1..1. .0..1..0..1..1 %e A303530 ..0..1..0..0..0. .1..0..1..0..1. .0..1..1..1..0. .0..1..0..1..0 %Y A303530 Cf. A303525. %K A303530 nonn %O A303530 1,1 %A A303530 _R. H. Hardin_, Apr 25 2018