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 A056916 #21 Jul 31 2019 11:24:09
%S A056916 1,2,9,32,625,648,117649,131072,4782969,12500000,25937424601,
%T A056916 214990848,23298085122481,1771684761728,14416259765625,
%U A056916 562949953421312,48661191875666868481,11712917736940032,104127350297911241532841,5120000000000000000,7788651757984142343081
%N A056916 Product of the orders of the elements in a cyclic group with n elements.
%H A056916 Amiram Eldar, <a href="/A056916/b056916.txt">Table of n, a(n) for n = 1..388</a>
%F A056916 a(n) = Product_{ d divides n } d^phi(d). - _Vladeta Jovovic_, Sep 10 2004
%p A056916 a:=n->mul(denom (k/n), k=1..n): seq(a(n), n=1..18); # _Zerinvary Lajos_, Apr 26 2008
%t A056916 Table[Product[n/GCD[n,i],{i,0,n-1}],{n,30}] (* _Harvey P. Dale_, Oct 24 2011 *)
%Y A056916 Cf. A057660.
%Y A056916 Cf. A067911, A071248.
%K A056916 nonn,nice
%O A056916 1,2
%A A056916 Sharon Sela (sharonsela(AT)hotmail.com), Feb 10 2002
%E A056916 Edited by _Dean Hickerson_, Mar 04 2002