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%I #8 Feb 01 2024 21:08:58
%S 1,2,4,12,32,120,288,1512,4096,15552,48000,240064,552960,3439800,
%T 9483264,35640000,134217728,673699800,1451188224,9644765256,
%U 23685120000,115605729792,401556013056,1996264531840,4566087106560,26244000000000,89961392102400,356237685227520
%N Number of primitive polynomials of degree n over GF(4).
%H Andrew Howroyd, <a href="/A027695/b027695.txt">Table of n, a(n) for n = 0..150</a>
%p with(numtheory): phi(4^n-1)/n;
%o (PARI) a(n) = if(n==0, 1, eulerphi(4^n-1)/n) \\ _Andrew Howroyd_, Feb 01 2024
%Y Column k=4 of A369291.
%K nonn
%O 0,2
%A _N. J. A. Sloane_
%E a(24) onwards from _Andrew Howroyd_, Feb 01 2024
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