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 A059723 Mean of first 2^n nonnegative powers of 3, i.e., (1 + 3 + 3^2 + ... + 3^(2^n-1))/2^n. 8
 1, 2, 10, 410, 1345210, 28953440450810, 26825654846035253786389446010, 46055408506791340513753409614892651037805514032327504332410 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Harry J. Smith, Table of n, a(n) for n = 0..11 FORMULA a(n) = (3^(2^n) - 1)/2^(n+1). EXAMPLE a(3) = (1 + 3 + 9 + 27 + 81 + 243 + 729 + 2187)/8 = 3280/8 = 410. PROG (PARI) { for (n=0, 11, write("b059723.txt", n, " ", (3^(2^n) - 1)/2^(n + 1)); ) } \\ Harry J. Smith, Jun 28 2009 CROSSREFS Cf. A059721, A059722. Sequence in context: A261007 A013034 A207140 * A265627 A112449 A011824 Adjacent sequences:  A059720 A059721 A059722 * A059724 A059725 A059726 KEYWORD nonn AUTHOR Henry Bottomley, Feb 07 2001 STATUS approved

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Last modified March 29 21:32 EDT 2020. Contains 333117 sequences. (Running on oeis4.)