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A074613 a(n) = 4^n + 7^n. 1
2, 11, 65, 407, 2657, 17831, 121745, 839927, 5830337, 40615751, 283523825, 1981521047, 13858064417, 96956119271, 678491508305, 4748635251767, 33237225536897, 232647693856391, 1628482317387185, 11399170063280087 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..19.

Index entries for linear recurrences with constant coefficients, signature (11,-28).

FORMULA

From Mohammad K. Azarian, Jan 11 2009: (Start)

G.f.: 1/(1-4*x) + 1/(1-7*x).

E.g.f.: e^(4*x) + e^(7*x). (End)

a(n) = 11*a(n-1) - 28*a(n-2) with a(0)=2, a(1)=11. - Vincenzo Librandi, Jul 21 2010

MATHEMATICA

Table[4^n + 7^n, {n, 0, 25}]

LinearRecurrence[{11, -28}, {2, 11}, 30] (* Harvey P. Dale, Oct 03 2013 *)

CROSSREFS

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

Sequence in context: A161947 A001565 A199412 * A247109 A039632 A143816

Adjacent sequences:  A074610 A074611 A074612 * A074614 A074615 A074616

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Aug 26 2002

STATUS

approved

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Last modified April 19 08:43 EDT 2019. Contains 322241 sequences. (Running on oeis4.)