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%I #13 Nov 30 2021 18:50:17
%S 1,2,10,410,1345210,28953440450810,26825654846035253786389446010,
%T 46055408506791340513753409614892651037805514032327504332410
%N Mean of the first 2^n nonnegative powers of 3, i.e., (1 + 3 + 3^2 + ... + 3^(2^n-1))/2^n.
%H Harry J. Smith, <a href="/A059723/b059723.txt">Table of n, a(n) for n = 0..11</a>
%F a(n) = (3^(2^n) - 1)/2^(n+1).
%e a(3) = (1 + 3 + 9 + 27 + 81 + 243 + 729 + 2187)/8 = 3280/8 = 410.
%o (PARI) { for (n=0, 11, write("b059723.txt", n, " ", (3^(2^n) - 1)/2^(n + 1)); ) } \\ _Harry J. Smith_, Jun 28 2009
%Y Cf. A059721, A059722.
%K nonn
%O 0,2
%A _Henry Bottomley_, Feb 07 2001
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