A074573 a(n) = 5^n + 6^n + 9^n.

3, 20, 142, 1070, 8482, 69950, 593722, 5141030, 45116962, 399451310, 3557016202, 31792684790, 284850459442, 2556147225470, 22961260134682, 206391834657350, 1855993886649922, 16694871298564430, 150200009950933162

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..300

Index entries for linear recurrences with constant coefficients, signature (20,-129,270).

Formula

From Mohammad K. Azarian, Dec 30 2008: (Start)

G.f.: 1/(1-5*x) + 1/(1-6*x) + 1/(1-9*x).

E.g.f.: e^(5*x) + e^(6*x) + e^(9*x). (End)

Mathematica

Table[5^n + 6^n + 9^n, {n, 0, 20}]

Prog

(Magma) [5^n + 6^n + 9^n: n in [0..20]]; // Vincenzo Librandi, May 20 2011

Crossrefs

Cf. A001550, A001576, A034513, A001579, A074501-A074580.

Sequence in context: A342055 A371411 A009156 * A068571 A074569 A026303

Adjacent sequences: A074570 A074571 A074572 * A074574 A074575 A074576

Keyword

easy,nonn

Author

Robert G. Wilson v, Aug 23 2002

Status

approved