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A074604 a(n) = 2^n + 9^n. 1
2, 11, 85, 737, 6577, 59081, 531505, 4783097, 43046977, 387421001, 3486785425, 31381061657, 282429540577, 2541865836521, 22876792471345, 205891132127417, 1853020188917377, 16677181699797641, 150094635297261265 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Index entries for linear recurrences with constant coefficients, signature (11,-18).

FORMULA

a(n) = 9*a(n-1) - 2^n = 11*a(n-1) - 18*a(n-2).

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

G.f.: 1/(1-2*x) + 1/(1-9*x).

E.g.f.: e^(2*x) + e^(9*x). (End)

MATHEMATICA

Table[2^n + 9^n, {n, 0, 25}]

PROG

(MAGMA) [2^n + 9^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: A086406 A158098 A104185 * A135404 A153304 A240998

Adjacent sequences:  A074601 A074602 A074603 * A074605 A074606 A074607

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Aug 25 2002

STATUS

approved

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Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)