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A074537
a(n) = 2^n + 5^n + 6^n.
1
3, 13, 65, 349, 1937, 10933, 62345, 358189, 2070497, 12031333, 70232825, 411627229, 2420927057, 14281405333, 84467696105, 500702595469, 2973697863617, 17689599028933, 105374654196185, 628433226862909
OFFSET
0,1
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)
MATHEMATICA
Table[2^n + 5^n + 6^n, {n, 0, 20}]
PROG
(Magma) [2^n + 5^n + 6^n: n in [0..25]]; // Vincenzo Librandi, Jun 11 2011
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Aug 23 2002
STATUS
approved