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 A297719 #4 Jan 04 2018 21:58:30 %S A297719 37,2651,68919,2699832,107787351,4021047904,154327332017, %T A297719 5920531350715,226188909640209,8657932603026022,331360189636829166, %U A297719 12678860316903190032,485194134262201742340,18567112995250259829761 %N A297719 Number of nX7 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 4 neighboring 1s. %C A297719 Column 7 of A297720. %H A297719 R. H. Hardin, <a href="/A297719/b297719.txt">Table of n, a(n) for n = 1..210</a> %e A297719 Some solutions for n=3 %e A297719 ..0..0..0..0..1..0..0. .1..1..0..0..0..0..0. .1..0..0..1..0..0..0 %e A297719 ..1..0..0..1..0..0..0. .0..1..0..0..0..1..1. .0..1..1..1..0..0..0 %e A297719 ..1..1..0..0..1..1..0. .0..0..1..0..0..1..0. .0..1..0..0..1..1..1 %Y A297719 Cf. A297720. %K A297719 nonn %O A297719 1,1 %A A297719 _R. H. Hardin_, Jan 04 2018