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 A301954 #4 Mar 29 2018 12:48:05 %S A301954 0,34,342,7326,120815,2406169,45013365,854043977,16129710295, %T A301954 305221439281,5771629701788,109164158236088,2064580944616050, %U A301954 39047423296702605,738499892840155074,13967193695049173564 %N A301954 Number of 5Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A301954 Row 5 of A301951. %H A301954 R. H. Hardin, <a href="/A301954/b301954.txt">Table of n, a(n) for n = 1..210</a> %e A301954 Some solutions for n=5 %e A301954 ..0..0..0..0..0. .0..0..1..1..1. .0..0..0..0..0. .0..0..1..0..1 %e A301954 ..0..1..0..1..1. .0..1..0..0..0. .0..0..0..0..0. .1..1..0..1..0 %e A301954 ..1..0..1..0..0. .0..0..1..1..0. .1..1..1..0..0. .1..1..1..0..0 %e A301954 ..0..1..1..1..0. .0..1..0..0..1. .1..0..0..0..1. .1..0..0..1..1 %e A301954 ..1..1..0..0..0. .0..0..0..1..1. .1..1..0..1..1. .0..0..1..1..1 %Y A301954 Cf. A301951. %K A301954 nonn %O A301954 1,2 %A A301954 _R. H. Hardin_, Mar 29 2018