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A074602 a(n) = 2^n + 7^n. 2
2, 9, 53, 351, 2417, 16839, 117713, 823671, 5765057, 40354119, 282476273, 1977328791, 13841291297, 96889018599, 678223089233, 4747561542711, 33232930635137, 232630514118279, 1628413598172593, 11398895185897431 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (9,-14).

FORMULA

a(n) = 7*a(n-1) - 2^n = 9*a(n-1) - 14*a(n-2).

From Mohammad K. Azarian, Jan 02 2009: (Start)

G.f.: 1/(1-2*x) + 1/(1-7*x).

E.g.f.: e^(2*x) + e^(7*x). (End)

MATHEMATICA

Table[2^n + 7^n, {n, 0, 25}]

PROG

(MAGMA) [2^n + 7^n: n in [0..35]]; // Vincenzo Librandi, Apr 30 2011

CROSSREFS

Cf. A000051, A034472, A052539, A034474, A062394, A034491, A062395, A062396, A007689, A063376, A063481, A074600 - A074624.

Sequence in context: A124347 A266469 A080146 * A192131 A326287 A231493

Adjacent sequences:  A074599 A074600 A074601 * A074603 A074604 A074605

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Aug 25 2002

STATUS

approved

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Last modified September 21 23:55 EDT 2019. Contains 327286 sequences. (Running on oeis4.)