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A171371 a(n) = 6*a(n-1)+8*a(n-2) with a(1) = 8, a(2) = 18. 1
8, 18, 172, 1176, 8432, 60000, 427456, 3044736, 21688064, 154486272, 1100422144, 7838423040, 55833915392, 397710876672, 2832936583168, 20179306512384, 143739331739648, 1023870442536960, 7293137309138944, 51949787395129344, 370043822843887616 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Seen on a quiz.

The recurrence was supplied by Zak Seidov, Dec 07 2009.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

Index to sequences with linear recurrences with constant coefficients, signature (6,8).

FORMULA

G.f.: 2*x*(-4 + 15*x)/(-1 + 6*x + 8*x^2). - Veikko Pohjola, Dec 07 2009

a(n) = 8*A189800(n) -30*A189800(n-1). - R. J. Mathar, Nov 17 2011

PROG

(MAGMA) I:=[8, 18]; [n le 2 select I[n] else 6*Self(n-1)+8*Self(n-2): n in [1..30]]; Vincenzo Librandi, Nov 18 2011

CROSSREFS

Sequence in context: A173734 A219524 A215174 * A092692 A001151 A177367

Adjacent sequences:  A171368 A171369 A171370 * A171372 A171373 A171374

KEYWORD

nonn,easy

AUTHOR

Anonymous, Dec 06 2009

EXTENSIONS

More terms from N. J. A. Sloane, Dec 07 2009

G.f. and name adapted to the offset by Bruno Berselli, Apr 04 2011

STATUS

approved

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Last modified September 30 05:01 EDT 2014. Contains 247417 sequences.