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 A186983 #6 Mar 30 2012 17:37:34
%S A186983 6,6,6,8,64,65,284,297,324,339,1116,1144,1784,1886,2449,2576,6499,
%T A186983 6527,14386,16178,17683,18649,21003,21395,42708,44997,48966,50310,
%U A186983 93138,93852,163212,170778,178896,187722,310605,315687,408771,419661,453255
%N A186983 Number of 7-element subsets of {1, 2, ..., n} having pairwise coprime elements.
%H A186983 Alois P. Heinz, <a href="/A186983/b186983.txt">Table of n, a(n) for n = 13..200</a>
%e A186983 a(16) = 8 because there are 8 7-element subsets of {1, 2, ..., 16} having pairwise coprime elements: {1,5,7,9,11,13,16}, {1,5,7,8,9,11,13}, {1,2,3,5,7,11,13}, {1,2,5,7,9,11,13}, {1,3,4,5,7,11,13}, {1,3,5,7,8,11,13}, {1,3,5,7,11,13,16}, {1,4,5,7,9,11,13}.
%Y A186983 Column 7 of triangle A186974. Partial sums of A186978.
%K A186983 nonn
%O A186983 13,1
%A A186983 _Alois P. Heinz_, Mar 02 2011