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 A301796 #6 Sep 03 2022 22:51:48 %S A301796 64,610,192,221,275,364,508,741,1118,1728,2715,4312,6896,11077,17842, %T A301796 28788,46499,75156,121524,196549,317942,514360,832171,1346400,2178440, %U A301796 3524709,5703018,9227596,14930483,24157948,39088300,63246117,102334286 %N A301796 Number of 7 X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A301796 Row 7 of A301790. %H A301796 R. H. Hardin, <a href="/A301796/b301796.txt">Table of n, a(n) for n = 1..210</a> %F A301796 Empirical: a(n) = 2*a(n-1) -a(n-3) for n>7. %e A301796 Some solutions for n=5 %e A301796 ..0..1..0..1..0. .0..1..1..0..0. .0..1..0..1..0. .0..0..1..1..0 %e A301796 ..0..1..0..1..0. .0..0..1..1..0. .0..1..0..1..0. .1..0..0..1..1 %e A301796 ..1..0..1..0..1. .1..0..0..1..0. .0..1..0..1..0. .1..1..0..0..1 %e A301796 ..1..0..1..0..0. .1..1..0..1..0. .0..1..0..1..0. .0..1..1..0..0 %e A301796 ..1..0..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..1..1..0 %e A301796 ..1..0..0..1..0. .0..1..0..1..1. .0..1..0..1..1. .1..0..0..1..0 %e A301796 ..1..1..0..1..0. .0..1..0..0..1. .0..1..0..0..1. .1..1..0..1..0 %Y A301796 Cf. A301790. %K A301796 nonn %O A301796 1,1 %A A301796 _R. H. Hardin_, Mar 26 2018