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 A217543 #8 Nov 19 2014 04:09:36 %S A217543 17,17,289,1401,10213,64473,431241,2824177,18626981,122511585, %T A217543 806649933,5309370017,34951088945,230067107597,1514453687653, %U A217543 9969070507989,65622772473105,431970507432905,2843503407066145,18717737327894065 %N A217543 Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random 0..2 n X 4 array. %C A217543 Column 4 of A217547. %H A217543 R. H. Hardin, <a href="/A217543/b217543.txt">Table of n, a(n) for n = 1..33</a> %e A217543 Some solutions for n=3: %e A217543 ..1..1..1..2....1..1..2..2....0..0..1..1....1..1..2..2....0..0..0..1 %e A217543 ..0..0..0..2....1..1..0..0....0..0..0..1....1..1..2..2....0..0..0..1 %e A217543 ..0..0..0..2....1..1..0..0....0..0..0..2....2..2..2..2....0..0..1..2 %Y A217543 Cf. A217547. %K A217543 nonn %O A217543 1,1 %A A217543 _R. H. Hardin_, Oct 06 2012