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A053639 Ceiling(2^(n+1)/n). 1
4, 4, 6, 8, 13, 22, 37, 64, 114, 205, 373, 683, 1261, 2341, 4370, 8192, 15421, 29128, 55189, 104858, 199729, 381301, 729445, 1398102, 2684355, 5162221, 9942054, 19173962, 37025581, 71582789, 138547333, 268435456, 520602097 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Table[Ceiling[2^(n+1)/n], {n, 1, 30}] (* Vincenzo Librandi, Dec 19 2011 *)

PROG

(MAGMA) [Ceiling(2^(n+1)/n): n in [1..40]]; // Vincenzo Librandi, Dec 19 2011

CROSSREFS

Sequence in context: A090682 A011982 A175216 * A100090 A074161 A201401

Adjacent sequences:  A053636 A053637 A053638 * A053640 A053641 A053642

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Mar 23 2000

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.