A074555 a(n) = 3^n + 6^n + 7^n.

3, 16, 94, 586, 3778, 24826, 165034, 1105666, 7450978, 50450986, 343000474, 2340300946, 16018600978, 109951298746, 756592019914, 5217760843426, 36054083523778, 249557302572106, 1729973941999354, 12008256087645106

Offset

0,1

Links

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

Index entries for linear recurrences with constant coefficients, signature (16,-81,126).

Formula

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

G.f.: 1/(1-3*x) + 1/(1-6*x) + 1/(1-7*x).

E.g.f.: exp(3*x) + exp(6*x) + exp(7*x). (End)

Mathematica

Table[3^n + 6^n + 7^n, {n, 0, 20}]

Prog

(Magma) [3^n + 6^n + 7^n: n in [0..20]]; // Vincenzo Librandi, Aug 24 2011

Crossrefs

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

Sequence in context: A371742 A213229 A323968 * A137644 A114174 A181067

Adjacent sequences: A074552 A074553 A074554 * A074556 A074557 A074558

Keyword

easy,nonn

Author

Robert G. Wilson v, Aug 23 2002

Status

approved