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 A297578 #4 Jan 01 2018 11:09:02 %S A297578 4,17,72,254,1104,4428,17549,71541,288624,1160216,4688893,18915890, %T A297578 76255262,307700021,1241251737,5006436549,20196297041,81469428031, %U A297578 328628315656,1325648873979,5347476219467,21570824670637,87013568475744 %N A297578 Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 4 neighboring 1s. %C A297578 Column 4 of A297582. %H A297578 R. H. Hardin, <a href="/A297578/b297578.txt">Table of n, a(n) for n = 1..210</a> %F A297578 Empirical: a(n) = a(n-1) +6*a(n-2) +24*a(n-3) +14*a(n-4) -26*a(n-5) -40*a(n-6) -35*a(n-7) +23*a(n-8) +48*a(n-9) -5*a(n-10) -7*a(n-11) -a(n-12) -2*a(n-14) -a(n-15) +a(n-16) %e A297578 Some solutions for n=7 %e A297578 ..0..0..0..0. .0..0..0..1. .0..1..1..1. .0..1..0..0. .0..0..0..1 %e A297578 ..0..0..0..0. .0..1..1..1. .0..1..0..1. .1..0..0..1. .0..1..1..0 %e A297578 ..1..1..0..0. .0..0..0..1. .0..0..0..0. .0..0..1..0. .0..1..0..1 %e A297578 ..0..0..0..1. .0..0..0..0. .0..1..0..0. .1..0..0..0. .0..0..0..0 %e A297578 ..0..1..1..1. .0..0..1..0. .1..0..0..0. .0..1..0..0. .0..1..0..1 %e A297578 ..0..1..0..0. .1..1..1..0. .1..0..1..0. .0..0..0..1. .0..1..1..1 %e A297578 ..0..0..0..0. .1..0..0..0. .1..1..1..0. .0..0..1..0. .0..0..0..0 %Y A297578 Cf. A297582. %K A297578 nonn %O A297578 1,1 %A A297578 _R. H. Hardin_, Jan 01 2018