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 A302169 #4 Apr 02 2018 14:53:55 %S A302169 64,86,111,361,621,1563,2853,7306,12963,33522,61775,157788,293072, %T A302169 746806,1414502,3560709,6821117,17041351,33109869,81878009,160823108, %U A302169 394307941,783258522,1903510955,3817195020,9202579162,18623741941,44557228577 %N A302169 Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302169 Row 7 of A302163. %H A302169 R. H. Hardin, <a href="/A302169/b302169.txt">Table of n, a(n) for n = 1..210</a> %H A302169 R. H. Hardin, <a href="/A302169/a302169.txt">Empirical recurrence of order 80</a> %F A302169 Empirical recurrence of order 80 (see link above) %e A302169 Some solutions for n=5 %e A302169 ..0..0..1..1..0. .0..1..1..0..1. .0..1..0..0..1. .0..1..1..0..1 %e A302169 ..0..1..0..1..0. .1..0..1..0..1. .1..1..0..1..0. .1..0..1..0..1 %e A302169 ..0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1 %e A302169 ..0..1..0..1..1. .1..0..1..0..1. .0..1..0..1..1. .1..0..1..0..1 %e A302169 ..0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1 %e A302169 ..1..0..0..1..0. .1..0..1..0..0. .0..1..0..1..0. .1..0..1..0..1 %e A302169 ..1..0..1..0..0. .1..0..1..0..1. .0..1..1..0..0. .1..0..0..1..1 %Y A302169 Cf. A302163. %K A302169 nonn %O A302169 1,1 %A A302169 _R. H. Hardin_, Apr 02 2018