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 A302677 #4 Apr 11 2018 12:26:20 %S A302677 8,7,18,30,63,125,257,528,1085,2228,4576,9401,19311,39665,81476, %T A302677 167363,343782,706162,1450533,2979557,6120333,12571820,25823881, %U A302677 53045060,108960300,223816249,459742831,944361613,1939821080,3984602671 %N A302677 Number of nX5 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302677 Column 5 of A302680. %H A302677 R. H. Hardin, <a href="/A302677/b302677.txt">Table of n, a(n) for n = 1..210</a> %F A302677 Empirical: a(n) = a(n-1) +3*a(n-3) +2*a(n-4) +2*a(n-5) for n>10 %e A302677 Some solutions for n=5 %e A302677 ..0..1..1..1..0. .0..1..0..0..0. .0..0..0..1..0. .0..1..1..1..0 %e A302677 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302677 ..0..0..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0 %e A302677 ..0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302677 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..1..0..1..0 %Y A302677 Cf. A302680. %K A302677 nonn %O A302677 1,1 %A A302677 _R. H. Hardin_, Apr 11 2018