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 A174471 #2 Mar 30 2012 18:37:21
%S A174471 1,1,5,32,4138,7371,362821209,363768114,4399869984980,4692111613957,
%T A174471 100023774005024513,100145112875103405,137370551968043406735177291498,
%U A174471 137370551970759432867153686743,687082347540023318264721577813
%N A174471 G.f.: exp( Sum_{n>=1} A174472(n)*x^n/n ) where A174472(n) = Sum_{d|n} d^sigma(d).
%o A174471 (PARI) {a(n)=polcoeff(exp(sum(m=1,n,x^m/m*sumdiv(m,d,d^sigma(d)))+x*O(x^n)),n)}
%Y A174471 Cf. A174472, A000203 (sigma).
%K A174471 nonn
%O A174471 0,3
%A A174471 _Paul D. Hanna_, Apr 04 2010