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Generalized Euler phi function (for p=5).
2

%I #10 Mar 30 2012 17:36:33

%S 1,16,96,256,2500,9216,62496,147456,1499904,6250000,39037504,84934656,

%T 971882496,3905750016,23437500000,57415827456,610351562496,

%U 2249712009216,15258773437504,39062500000000,366140629499904,1523926718550016,9536743164062496,16231265527136256,238418579101562500

%N Generalized Euler phi function (for p=5).

%C For n>=2 a(n) is the number of n X n circulant invertible matrices over GF(5)

%o (PARI) /* see A003473, there set p=5 */

%Y Cf. A003473 (p=2), A003474 (p=3).

%K nonn

%O 1,2

%A _Joerg Arndt_, Jul 03 2011