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 A063475 #12 Jun 25 2018 22:55:20
%S A063475 1,1,5,1,10,5,10,5,26,5,50,10,21,21,85,10,91,21,50,26,122,21,130,50,
%T A063475 91,50,250,21,260,85,130,85,210,50,455,91,210,85,546,50,500,130,210,
%U A063475 122,530,85,500,130,341,210,850,91,546,210,455,250,842,85,1300,260,455,341
%N A063475 Sum_{d | H(n)} d^2, where H(n) is the Half-Totient function (A023022).
%H A063475 Harry J. Smith, <a href="/A063475/b063475.txt">Table of n, a(n) for n = 3..1000</a>
%o A063475 (PARI) H(n)=eulerphi(n)/2; j=[]; for(n=3,150,j=concat(j,sumdiv(H(n),d,d^2))); j
%o A063475 (PARI) { for (n=3, 1000, write("b063475.txt", n, " ", sumdiv(eulerphi(n)/2, d, d^2)) ) } \\ _Harry J. Smith_, Aug 22 2009
%Y A063475 Cf. A023022.
%K A063475 nonn
%O A063475 3,3
%A A063475 _Jason Earls_, Jul 27 2001