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 A186991 #6 Mar 30 2012 17:37:34
%S A186991 1,2,4,4,12,4,28,16,32,12,116,16,248,48,72,112,720,64,1447,190,380,
%T A186991 254,3444,247,2795,701,2410,784,11588,247,19472,4839,4802,3175,7300,
%U A186991 1449,45641,6191,10520,3908,82986,2124,124554,15874,17608
%N A186991 Number of subsets of {1, 2, ..., n} containing n and having <=7 pairwise coprime elements.
%H A186991 Alois P. Heinz, <a href="/A186991/b186991.txt">Table of n, a(n) for n = 1..200</a>
%Y A186991 Column 7 of triangle A186975. Sum of A186990 and A186978.
%K A186991 nonn
%O A186991 1,2
%A A186991 _Alois P. Heinz_, Mar 03 2011