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A140788 a(n) = 6*4^n + 2. 2
8, 26, 98, 386, 1538, 6146, 24578, 98306, 393218, 1572866, 6291458, 25165826, 100663298, 402653186, 1610612738, 6442450946, 25769803778, 103079215106, 412316860418, 1649267441666, 6597069766658, 26388279066626 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Also 2*A140660.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

FORMULA

From R. J. Mathar, Feb 07 2009: (Start)

a(n) = 5*a(n-1) - 4*a(n-2).

G.f.: 2(4-7x)/((1-x)(1-4x)). (End)

PROG

(MAGMA) [6*4^n+2: n in [0..30]]; // Vincenzo Librandi, Aug 08 2011

CROSSREFS

Sequence in context: A278769 A173365 A261971 * A082573 A112645 A220713

Adjacent sequences:  A140785 A140786 A140787 * A140789 A140790 A140791

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Jul 14 2008

EXTENSIONS

More terms from R. J. Mathar, Feb 07 2009

STATUS

approved

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Last modified January 20 02:48 EST 2019. Contains 319320 sequences. (Running on oeis4.)