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 A070524 #7 Jan 03 2017 02:27:50
%S A070524 0,2,7,5,341,3,55987,257,46873,205,11111111111,241,9726655034461,
%T A070524 39991,14709241,16777217,19676527011956855057,46441,
%U A070524 41660902667961039785743,16519105,8177824843189,9090909091,357686347714896679177439424707
%N A070524 Value of n-th cyclotomic polynomial at phi(n).
%e A070524 n=6: the 6th cyclotomic polynomial is 1 - x + xx, phi(6)=2, C(6, phi(6)) = C(6,2) = 1 - 2 + 4 = 3 = a(6).
%t A070524 Table[Cyclotomic[w, EulerPhi[w]], {w, 1, 25}]
%Y A070524 Cf. A070518-A070523.
%K A070524 easy,nonn
%O A070524 1,2
%A A070524 _Labos Elemer_, May 02 2002