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 A297768 #4 Jan 05 2018 19:04:46 %S A297768 1,69,28565,720785,18733087,1504842706,108229776807,5471123716394, %T A297768 286817881089193,17003133505644511,992034690844277806, %U A297768 55560988268455263857,3131312608795918940918,178941939002152696425045 %N A297768 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s. %C A297768 Row 7 of A297762. %H A297768 R. H. Hardin, <a href="/A297768/b297768.txt">Table of n, a(n) for n = 1..210</a> %e A297768 Some solutions for n=3 %e A297768 ..0..1..1. .1..1..0. .0..1..0. .1..1..0. .0..1..0. .1..1..0. .0..0..0 %e A297768 ..0..1..1. .1..1..1. .1..0..1. .1..1..0. .1..1..1. .0..1..1. .1..1..0 %e A297768 ..0..1..1. .0..0..0. .0..1..0. .1..1..0. .1..0..0. .0..0..0. .1..1..0 %e A297768 ..0..1..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..1..1 %e A297768 ..0..1..1. .1..1..1. .0..0..0. .0..1..1. .0..1..1. .1..1..0. .1..0..0 %e A297768 ..0..1..1. .0..1..1. .0..1..1. .1..1..0. .1..1..0. .0..1..1. .1..1..1 %e A297768 ..0..1..1. .1..1..0. .1..1..1. .1..1..1. .1..1..1. .0..0..0. .0..1..1 %Y A297768 Cf. A297762. %K A297768 nonn %O A297768 1,2 %A A297768 _R. H. Hardin_, Jan 05 2018