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 A175504 #7 Nov 21 2013 12:50:01
%S A175504 1,1,3,4,125,6,16807,512,59049,1000,2357947691,1728,1792160394037,
%T A175504 537824,170859375,268435456,2862423051509815793,1889568,
%U A175504 5480386857784802185939,1280000000,350277500542221
%N A175504 a(n) = n ^ (phi(n) - 1), phi(n) = A000010(n) = Euler totient function.
%C A175504 a(n) = A062981(n) / n. a(n) = A001783(n) / n * Product_{d|n} (d!/d^d)^A008683(n/d) = (Product_{GCD(k, n)=1} k) / (n * Product_{d|n} (d!/d^d)^A008683(n/d)).
%t A175504 Table[n^(EulerPhi[n]-1),{n,25}] (* _Harvey P. Dale_, Feb 13 2011 *)
%o A175504 (PARI) a(n)=n^(eulerphi(n)-1) \\ _Charles R Greathouse IV_, Mar 05 2013
%K A175504 nonn
%O A175504 1,3
%A A175504 _Jaroslav Krizek_, May 31 2010