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 A301961 #4 Mar 29 2018 13:00:02 %S A301961 8,14,41,111,311,874,2454,6906,19427,54659,153785,432694,1217420, %T A301961 3425350,9637573,27116351,76294719,214663346,603978142,1699356882, %U A301961 4781321499,13452757355,37850765441,106497159950,299641101508,843072151982 %N A301961 Number of nX5 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A301961 Column 5 of A301964. %H A301961 R. H. Hardin, <a href="/A301961/b301961.txt">Table of n, a(n) for n = 1..210</a> %F A301961 Empirical: a(n) = 2*a(n-1) +3*a(n-2) -a(n-3) -2*a(n-4) -3*a(n-5) +2*a(n-6) for n>8 %e A301961 Some solutions for n=5 %e A301961 ..0..1..0..0..1. .0..0..1..1..0. .0..0..1..0..0. .0..0..1..0..1 %e A301961 ..0..1..1..0..1. .1..0..0..1..1. .1..0..1..1..0. .1..0..1..0..1 %e A301961 ..0..0..1..0..1. .1..1..0..0..1. .1..0..0..1..1. .1..0..0..0..1 %e A301961 ..1..0..1..0..1. .0..1..1..0..1. .1..1..0..0..1. .1..0..1..0..1 %e A301961 ..1..0..1..0..1. .0..0..1..0..0. .0..1..1..0..0. .1..0..1..0..1 %Y A301961 Cf. A301964. %K A301961 nonn %O A301961 1,1 %A A301961 _R. H. Hardin_, Mar 29 2018