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 A301399 #4 Mar 20 2018 11:01:41 %S A301399 0,41,554,15538,521514,16325745,528025038,16971131642,546618326745, %T A301399 17603736711807,566956049378525,18260390329067940,588124654381330816, %U A301399 18942222518786814929,610087935644210871329,19649617831383406991765 %N A301399 Number of nX7 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A301399 Column 7 of A301400. %H A301399 R. H. Hardin, <a href="/A301399/b301399.txt">Table of n, a(n) for n = 1..210</a> %e A301399 Some solutions for n=5 %e A301399 ..0..0..0..0..0..0..0. .0..0..0..0..0..0..0. .0..0..1..1..1..1..1 %e A301399 ..0..0..1..1..0..0..1. .0..0..0..0..0..0..0. .0..0..1..1..1..1..0 %e A301399 ..0..1..1..0..1..1..1. .0..1..1..0..1..1..1. .0..1..1..1..0..0..0 %e A301399 ..0..1..0..1..1..1..1. .0..1..1..1..1..1..0. .0..0..1..1..0..1..1 %e A301399 ..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..1..0..0..1..1 %Y A301399 Cf. A301400. %K A301399 nonn %O A301399 1,2 %A A301399 _R. H. Hardin_, Mar 20 2018