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 A300775 #4 Mar 12 2018 11:28:29 %S A300775 0,41,330,3482,78932,1413931,27354464,538564737,10457318118, %T A300775 204864839579,4003320568347,78291006560110,1531185041826193, %U A300775 29942985522306312,585589511612781035,11452027270290422629,223961431020068238434 %N A300775 Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A300775 Column 7 of A300776. %H A300775 R. H. Hardin, <a href="/A300775/b300775.txt">Table of n, a(n) for n = 1..210</a> %e A300775 Some solutions for n=5 %e A300775 ..0..0..0..1..1..0..0. .0..0..1..1..0..0..0. .0..0..0..0..0..0..1 %e A300775 ..0..0..1..1..1..0..1. .0..1..1..1..0..0..1. .0..1..1..0..0..1..1 %e A300775 ..1..1..0..0..1..1..1. .0..1..1..1..0..1..1. .1..1..0..1..0..0..0 %e A300775 ..1..1..0..0..1..0..0. .0..1..1..1..0..1..1. .0..0..1..1..0..0..1 %e A300775 ..1..1..1..1..0..0..0. .0..0..0..0..0..1..1. .0..0..1..1..0..1..1 %Y A300775 Cf. A300776. %K A300775 nonn %O A300775 1,2 %A A300775 _R. H. Hardin_, Mar 12 2018