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 A302881 #4 Apr 15 2018 10:37:13 %S A302881 32,42,209,858,4849,45897,359518,2795440,24612087,229678996, %T A302881 2033049729,17595489212,158734355515,1457646451815,13060861095622, %U A302881 115840845731074,1044452206802108,9479995763726021,85151645686087391,761720310814435390 %N A302881 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302881 Row 6 of A302877. %H A302881 R. H. Hardin, <a href="/A302881/b302881.txt">Table of n, a(n) for n = 1..210</a> %e A302881 Some solutions for n=5 %e A302881 ..0..1..1..1..1. .0..0..0..1..0. .0..0..1..0..1. .0..1..0..1..0 %e A302881 ..1..1..1..0..0. .0..1..0..1..0. .1..1..1..0..0. .0..0..0..1..0 %e A302881 ..0..1..1..1..1. .0..1..0..1..0. .1..0..0..0..0. .0..1..1..1..0 %e A302881 ..1..1..1..0..0. .0..1..0..1..1. .0..0..0..0..1. .0..1..0..1..0 %e A302881 ..1..1..0..1..0. .0..0..0..1..0. .1..0..1..1..1. .0..1..0..1..0 %e A302881 ..0..1..0..1..0. .1..1..0..1..0. .1..0..0..0..1. .0..1..0..0..1 %Y A302881 Cf. A302877. %K A302881 nonn %O A302881 1,1 %A A302881 _R. H. Hardin_, Apr 15 2018