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 A302876 #4 Apr 15 2018 10:33:40 %S A302876 21,363,722,5871,41498,359518,3780984,44888558,569313013,7621363641, %T A302876 104570444900,1454457203293,20411212109809,287723152198003, %U A302876 4065886450724385,57544773261064748,815093693449992494 %N A302876 Number of nX7 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 A302876 Column 7 of A302877. %H A302876 R. H. Hardin, <a href="/A302876/b302876.txt">Table of n, a(n) for n = 1..210</a> %e A302876 Some solutions for n=5 %e A302876 ..0..1..0..0..0..1..0. .0..1..1..1..1..1..1. .0..1..1..1..0..1..1 %e A302876 ..1..1..0..1..1..1..0. .1..0..1..1..0..0..1. .1..1..1..1..1..0..1 %e A302876 ..0..1..0..1..0..1..0. .1..0..1..0..1..0..1. .1..1..1..0..0..0..0 %e A302876 ..0..0..0..1..0..1..0. .1..0..1..0..1..0..1. .0..1..0..0..0..0..1 %e A302876 ..1..1..0..1..1..0..0. .1..0..0..0..1..1..1. .1..0..0..0..0..1..0 %Y A302876 Cf. A302877. %K A302876 nonn %O A302876 1,1 %A A302876 _R. H. Hardin_, Apr 15 2018