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 A085948 #3 May 10 2013 12:45:14
%S A085948 1,3,10,27,74,176,431,987,2259,5025,11168,24351,53022,114204,245221,
%T A085948 523173,1112996,2356796,4978235,10480426,22014499,46125601,96457248,
%U A085948 201300980,419404740,872360898,1811883714,3757979313,7784511152
%N A085948 Total number of elements in all subsets of {1,2,..,n} with relatively prime elements.
%F A085948 Partial sums of A085411. G.f.: 1/(1-x)*Sum_{k>=0} mu(k)*x^k*(1-x^k)/(1-2*x^k)^2.
%K A085948 nonn
%O A085948 1,2
%A A085948 _Vladeta Jovovic_, Aug 17 2003