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 A302074 #4 Mar 31 2018 15:48:56 %S A302074 64,8192,190528,6048836,180330117,5420105343,163660519064, %T A302074 4926680696151,148486135409554,4473321647227168,134766772583347037, %U A302074 4060050293871714740,122318436951115950082,3685280972257096460292,111034886878989197205405 %N A302074 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A302074 Row 7 of A302069. %H A302074 R. H. Hardin, <a href="/A302074/b302074.txt">Table of n, a(n) for n = 1..210</a> %e A302074 Some solutions for n=5 %e A302074 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A302074 ..1..1..1..0..0. .1..1..1..0..0. .1..1..1..0..0. .1..1..1..0..0 %e A302074 ..0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..1 %e A302074 ..0..0..1..0..1. .0..1..1..0..0. .0..0..1..0..1. .1..0..0..0..0 %e A302074 ..0..1..1..0..1. .0..0..1..1..1. .0..1..0..1..1. .1..0..1..1..1 %e A302074 ..0..1..0..0..1. .0..1..0..1..0. .1..1..0..1..0. .0..1..0..1..0 %e A302074 ..0..1..0..0..0. .0..1..0..1..0. .0..1..0..0..1. .0..1..0..1..0 %Y A302074 Cf. A302069. %K A302074 nonn %O A302074 1,1 %A A302074 _R. H. Hardin_, Mar 31 2018