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 A297761 #4 Jan 05 2018 18:59:47 %S A297761 1,733,24801,759243,45618455,2301783905,108229776807,5394743533114, %T A297761 267870723932943,13164280362488109,649645311987327236, %U A297761 32083173143952274627,1582748891993544903545,78096927219843019316942 %N A297761 Number of nX7 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s. %C A297761 Column 7 of A297762. %H A297761 R. H. Hardin, <a href="/A297761/b297761.txt">Table of n, a(n) for n = 1..210</a> %e A297761 Some solutions for n=3 %e A297761 ..1..1..1..0..1..1..0. .0..1..1..1..0..1..1. .1..1..1..0..0..1..0 %e A297761 ..0..1..0..1..1..1..1. .1..1..0..0..1..1..1. .1..1..1..0..1..1..1 %e A297761 ..0..0..1..1..0..0..0. .0..0..0..1..1..0..0. .0..1..0..1..0..1..1 %Y A297761 Cf. A297762. %K A297761 nonn %O A297761 1,2 %A A297761 _R. H. Hardin_, Jan 05 2018