|
| |
|
|
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
|
| |
|
|
