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 A174473 #2 Mar 30 2012 18:37:21
%S A174473 1,1,3,6,25,36,294,368,1528,2484,9134,14149,309394,338144,1088916,
%T A174473 2036379,8135079,11985949,85274614,109840952,443748960,721070985,
%U A174473 2618157358,4074809442,52689585877,60956862781,202828562711
%N A174473 G.f.: exp( Sum_{n>=1} A174937(n)*x^n/n ) where A174937(n) = Sum_{d|n} d^tau(d).
%C A174473 tau(n) = A000005(n) = the number of divisors of n.
%o A174473 (PARI) {a(n)=polcoeff(exp(sum(m=1,n,x^m/m*sumdiv(m,d,d^sigma(d,0)))+x*O(x^n)),n)}
%Y A174473 Cf. A174937, A000005 (tau).
%K A174473 nonn
%O A174473 0,3
%A A174473 _Paul D. Hanna_, Apr 04 2010