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 A186990 #6 Mar 30 2012 17:37:34
%S A186990 1,2,4,4,12,4,28,16,32,12,116,16,242,48,72,110,664,63,1228,177,353,
%T A186990 239,2667,219,2155,599,1847,657,7665,219,11613,3047,3297,2209,4946,
%U A186990 1057,24328,3902,6551,2564,40158,1410,55194,8308,9490
%N A186990 Number of subsets of {1, 2, ..., n} containing n and having <=6 pairwise coprime elements.
%H A186990 Alois P. Heinz, <a href="/A186990/b186990.txt">Table of n, a(n) for n = 1..200</a>
%Y A186990 Column 6 of triangle A186975. Sum of A186989 and A186977.
%K A186990 nonn
%O A186990 1,2
%A A186990 _Alois P. Heinz_, Mar 03 2011