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 A302155 #6 Jun 26 2022 20:52:34 %S A302155 64,1,260,1025,8152,128319,1728734,26544210,439103633,7478635467, %T A302155 131386907715,2344378104516,42235221450124,765312882037454, %U A302155 13907043370373429,253045503157946243,4606517701125024786 %N A302155 Number of 7 X n 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A302155 Row 7 of A302150. %H A302155 R. H. Hardin, <a href="/A302155/b302155.txt">Table of n, a(n) for n = 1..210</a> %e A302155 Some solutions for n=5 %e A302155 ..0..1..1..0..0. .0..1..0..1..1. .0..1..1..1..1. .0..1..1..1..0 %e A302155 ..1..1..0..0..0. .0..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1 %e A302155 ..1..1..1..0..0. .1..1..0..1..1. .0..1..1..1..1. .1..1..0..1..1 %e A302155 ..1..1..1..0..0. .1..1..1..1..1. .0..1..1..1..1. .1..1..1..1..1 %e A302155 ..1..1..0..0..1. .0..1..1..1..1. .0..1..1..1..0. .0..1..1..1..1 %e A302155 ..0..1..1..0..0. .0..1..1..1..1. .0..1..0..1..1. .1..1..1..1..1 %e A302155 ..1..1..0..0..1. .1..1..1..1..0. .1..1..1..1..0. .0..1..1..1..0 %Y A302155 Cf. A302150. %K A302155 nonn %O A302155 1,1 %A A302155 _R. H. Hardin_, Apr 02 2018