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 A297660 #6 Apr 26 2021 21:18:25 %S A297660 1,5854,346032,11089103,864944851,65775301075,3863740405975, %T A297660 241491673018271,16106282322466255,1037330977711576009, %U A297660 66060513585267380291,4262867141607164322540,275167885341459174925030 %N A297660 Number of 7 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1's. %C A297660 Row 7 of A297654. %H A297660 R. H. Hardin, <a href="/A297660/b297660.txt">Table of n, a(n) for n = 1..210</a> %e A297660 Some solutions for n=2 %e A297660 ..0..0. .1..1. .0..0. .1..1. .1..1. .1..1. .0..1. .1..0. .1..0. .0..0 %e A297660 ..1..0. .1..1. .1..1. .0..0. .1..0. .0..1. .1..0. .0..1. .1..1. .1..1 %e A297660 ..0..1. .1..1. .1..0. .0..1. .0..1. .1..1. .1..0. .1..1. .1..1. .1..1 %e A297660 ..1..0. .0..1. .1..1. .1..0. .1..1. .1..1. .0..1. .1..0. .1..0. .1..0 %e A297660 ..1..1. .1..0. .1..0. .1..1. .1..1. .1..1. .0..1. .1..1. .0..1. .0..0 %e A297660 ..1..0. .0..1. .0..1. .1..0. .1..0. .1..0. .1..1. .0..1. .1..1. .1..1 %e A297660 ..1..1. .1..0. .0..0. .0..1. .0..1. .0..0. .0..0. .1..0. .1..1. .0..0 %Y A297660 Cf. A297654. %K A297660 nonn %O A297660 1,2 %A A297660 _R. H. Hardin_, Jan 02 2018