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A074554
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3^n + 5^n + 9^n.
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1
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3, 17, 115, 881, 7267, 62417, 547795, 4863281, 43443907, 389393297, 3496609075, 31430064881, 282674208547, 2543088125777, 22882900753555, 205921664021681, 1853172819789187, 16677944768259857, 150098450381685235
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
| G.f.: 1/(1-3*x)+1/(1-5*x)+1/(1-9*x). E.g.f.: exp(3*x)+exp(5*x)+exp(9*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Dec 30 2008]
a(n) = +17*a(n-1) -87*a(n-2) +135*a(n-3)
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MATHEMATICA
| Table[3^n + 5^n + 9^n, {n, 0, 20}]
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PROG
| (MAGMA) [3^n + 5^n + 9^n: n in [0..30]]; // Vincenzo Librandi, Jun 13 2011
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CROSSREFS
| Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
Sequence in context: A131204 A174404 A112111 * A074544 A165976 A121572
Adjacent sequences: A074551 A074552 A074553 * A074555 A074556 A074557
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 23 2002
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