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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 December 15 11:05 EST 2018. Contains 318148 sequences. (Running on oeis4.)