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A074624 a(n) = 8^n + 9^n. 39
2, 17, 145, 1241, 10657, 91817, 793585, 6880121, 59823937, 521638217, 4560526225, 39970994201, 351149013217, 3091621642217, 27274838966065, 241075504183481, 2134495165562497, 18928981513351817, 168109033806481105 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
From Mohammad K. Azarian, Jan 11 2009: (Start)
G.f.: 1/(1-8*x) + 1/(1-9*x).
E.g.f.: exp(8*x) + exp(9*x). (End)
a(n) = 17*a(n-1) - 72*a(n-2) with a(0)=2, a(1)=17. - Vincenzo Librandi, Jul 21 2010
MAPLE
seq(8^n+9^n, n=0..30); # Robert Israel, Mar 11 2023
MATHEMATICA
Table[8^n + 9^n, {n, 0, 20}]
PROG
(PARI) a(n)=8^n+9^n \\ Charles R Greathouse IV, Apr 08 2016
(Magma) [8^n+9^n: n in [0..30]]; // G. C. Greubel, Mar 11 2023
(SageMath) [8^n+9^n for n in range(31)] # G. C. Greubel, Mar 11 2023
CROSSREFS
Sequence in context: A163066 A110815 A273340 * A245807 A295946 A176934
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Aug 26 2002
STATUS
approved

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Last modified March 19 06:05 EDT 2024. Contains 370952 sequences. (Running on oeis4.)