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A110286 15*2^n. 7
15, 30, 60, 120, 240, 480, 960, 1920, 3840, 7680, 15360, 30720, 61440, 122880, 245760, 491520, 983040, 1966080, 3932160, 7864320, 15728640, 31457280, 62914560, 125829120, 251658240, 503316480, 1006632960, 2013265920, 4026531840, 8053063680, 16106127360 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The first differences are the sequence itself. Doubling the terms gives the same sequence (beginning one step further).

a(n) = A173787(n+4,n). - Reinhard Zumkeller, Feb 28 2010

Subsequence of A051916. - Reinhard Zumkeller, Mar 20 2010

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..235

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (2)

FORMULA

G.f.: 15/(1-2x). - Philippe Deléham, Nov 23 2008

a(n) = A000079(n)*15 = A007283(n)*5 = A020714(n)*3. - Omar E. Pol, Dec 17 2008

a(n)=2*a(n-1) (with a(0)=15). - Vincenzo Librandi, Dec 26 2010

MATHEMATICA

15*2^Range[0, 60] (* Vladimir Joseph Stephan Orlovsky, Jun 09 2011 *)

NestList[2#&, 15, 30] (* Harvey P. Dale, Oct 19 2014 *)

PROG

(MAGMA) [15*2^n: n in [0..40]]; // Vincenzo Librandi, Apr 28 2011

(PARI) a(n)=15<<n \\ Charles R Greathouse IV, Oct 07 2015

CROSSREFS

Cf. A007283, A020714, A005009, A005010, A005015, A005029.

Sequence in context: A190715 A217744 A115811 * A254859 A127526 A249764

Adjacent sequences:  A110283 A110284 A110285 * A110287 A110288 A110289

KEYWORD

easy,nonn

AUTHOR

Alexandre Wajnberg, Sep 07 2005

EXTENSIONS

Edited by Omar E. Pol, Dec 16 2008

STATUS

approved

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Last modified November 19 11:04 EST 2017. Contains 294936 sequences.