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 A297801 #4 Jan 06 2018 09:31:58 %S A297801 1,381,6215,115773,4340367,123361724,3420197908,102189481612, %T A297801 2993486726263,87036084096735,2550795725760992,74669036575156557, %U A297801 2183108544954393549,63879977618932856370,1869145222162376267997 %N A297801 Number of nX7 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 5 neighboring 1s. %C A297801 Column 7 of A297802. %H A297801 R. H. Hardin, <a href="/A297801/b297801.txt">Table of n, a(n) for n = 1..210</a> %e A297801 Some solutions for n=4 %e A297801 ..0..0..0..0..1..1..1. .0..0..0..0..0..0..0. .0..0..1..1..0..1..0 %e A297801 ..0..1..0..1..0..1..1. .0..0..1..1..1..0..0. .1..1..0..0..1..0..1 %e A297801 ..1..1..1..1..0..0..0. .1..1..0..0..0..1..0. .0..1..1..0..1..1..1 %e A297801 ..0..1..1..0..0..0..0. .1..1..0..0..1..1..1. .0..1..1..0..1..1..0 %Y A297801 Cf. A297802. %K A297801 nonn %O A297801 1,2 %A A297801 _R. H. Hardin_, Jan 06 2018