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 A187268 #6 Mar 30 2012 17:37:34
%S A187268 1,3,7,11,23,27,55,71,103,115,231,247,495,543,615,727,1447,1511,2958,
%T A187268 3148,3528,3782,7226,7473,10268,10969,13379,14163,25751,25998,45470,
%U A187268 50309,55111,58286,65586,67035,112676,118867,129387,133295
%N A187268 Number of nonempty subsets of {1, 2, ..., n} with <=7 pairwise coprime elements.
%H A187268 Alois P. Heinz, <a href="/A187268/b187268.txt">Table of n, a(n) for n = 1..200</a>
%F A187268 a(n) = A187262(n,7).
%Y A187268 Column 7 of triangle A187262. First differences are A186991.
%K A187268 nonn
%O A187268 1,2
%A A187268 _Alois P. Heinz_, Mar 07 2011