A074537 a(n) = 2^n + 5^n + 6^n.
3, 13, 65, 349, 1937, 10933, 62345, 358189, 2070497, 12031333, 70232825, 411627229, 2420927057, 14281405333, 84467696105, 500702595469, 2973697863617, 17689599028933, 105374654196185, 628433226862909
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..200
- Index entries for linear recurrences with constant coefficients, signature (13,-52,60).
Programs
-
Magma
[2^n + 5^n + 6^n: n in [0..25]]; // Vincenzo Librandi, Jun 11 2011
-
Mathematica
Table[2^n + 5^n + 6^n, {n, 0, 20}]
Formula
From Mohammad K. Azarian, Dec 27 2008: (Start)
G.f.: 1/(1-2*x) + 1/(1-5*x) + 1/(1-6*x).
E.g.f.: exp(2*x) + exp(5*x) + exp(6*x). (End)