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 A115620 #7 Mar 31 2012 13:21:29
%S A115620 1,56,180,836,840,2400,4536,10584,10920,12540,17388,18720,23736,24864,
%T A115620 25500,26220,23760,32376,39560,45356,53960,49680,77744,71208,60720,
%U A115620 87032,62640,69120,63840,91776,76560,97128,118712,88560,83160
%N A115620 Phi(A033631(n)) {phi is the Euler totient function A000010}.
%H A115620 T. D. Noe, <a href="/A115620/b115620.txt">Table of n, a(n) for n=1..1000</a>
%K A115620 nonn
%O A115620 1,2
%A A115620 _Lekraj Beedassy_, Jan 26 2006
%E A115620 Corrected and extended by _Franklin T. Adams-Watters_, May 12 2006