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 A167531 #9 Sep 03 2019 12:08:14
%S A167531 1,3,4,9,6,25,8,49,37,101,12,373,14,477,496,1313,18,3907,20,6941,5272,
%T A167531 11309,24,49321,3151,53301,59320,144789,30,468181,32,657473,649936,
%U A167531 1114181,121416,5124961,38,4980813,6909280,13756761,42,44768725,44
%N A167531 a(n) = Sum_{d divides n} d*(n/d)^(d-1).
%H A167531 Seiichi Manyama, <a href="/A167531/b167531.txt">Table of n, a(n) for n = 1..5000</a>
%F A167531 G.f.: Sum{k>0} x^k/(1-k*x^k)^2.
%o A167531 (PARI) a(n)=sumdiv(n,d,d*(n/d)^(d-1))
%o A167531 (PARI) N=66; x='x+O('x^N); Vec(sum(k=1, N, x^k/(1-k*x^k)^2)) \\ _Seiichi Manyama_, Sep 03 2019
%Y A167531 Cf. A055225, A324158.
%K A167531 nonn
%O A167531 1,2
%A A167531 _Franklin T. Adams-Watters_, Nov 05 2009