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 A297763 #4 Jan 05 2018 19:01:19 %S A297763 1,2,12,31,78,225,733,2305,7156,22388,70737,223576,705927,2229237, %T A297763 7044181,22263130,70360408,222365159,702781362,2221173901,7020142785, %U A297763 22187534409,70124998492,221634512416,700490315089,2213945357924 %N A297763 Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s. %C A297763 Row 2 of A297762. %H A297763 R. H. Hardin, <a href="/A297763/b297763.txt">Table of n, a(n) for n = 1..210</a> %F A297763 Empirical: a(n) = 4*a(n-1) -3*a(n-2) +a(n-3) +6*a(n-4) -18*a(n-5) %e A297763 Some solutions for n=7 %e A297763 ..0..0..1..1..0..1..1. .0..1..1..1..1..1..0. .0..0..1..1..1..1..1 %e A297763 ..0..1..1..0..0..1..1. .0..1..1..0..1..1..1. .0..0..0..1..0..1..1 %Y A297763 Cf. A297762. %K A297763 nonn %O A297763 1,2 %A A297763 _R. H. Hardin_, Jan 05 2018