A074532 a(n) = 2^n + 4^n + 5^n.

3, 11, 45, 197, 897, 4181, 19785, 94637, 456417, 2215781, 10815225, 53024477, 260921937, 1287820181, 6371967465, 31591352717, 156882923457, 780119453381, 3883417004505, 19348364759357, 96466944316977, 481235206811381

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,-38,40).

Formula

From Mohammad K. Azarian, Dec 27 2008: (Start)

G.f.: 1/(1-2*x) + 1/(1-4*x) + 1/(1-5*x).

E.g.f.: exp(2*x) + exp(4*x) + exp(5*x). (End)

Mathematica

Table[2^n + 4^n + 5^n, {n, 0, 20}]

Prog

(Magma) [2^n + 4^n + 5^n: n in [0..25]]; // Vincenzo Librandi, Jun 11 2011

Crossrefs

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

Sequence in context: A151129 A151130 A216949 * A049186 A049160 A191243

Adjacent sequences: A074529 A074530 A074531 * A074533 A074534 A074535

Keyword

easy,nonn

Author

Robert G. Wilson v, Aug 23 2002

Status

approved