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2, 9, 45, 243, 1377, 8019, 47385, 282123, 1686177, 10097379, 60525225, 362974203, 2177313777, 13062288339, 78368947065, 470199333483, 2821152954177, 16926788584899, 101560344088905, 609360902271963, 3656161926847377
(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/(1-6*x). E.g.f.: e^(3*x)+e^(6*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Jan 11 2009]
a(n)=9*a(n-1)-18*a(n-2) with a(0)=2, a(1)=9 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 21 2010]
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MATHEMATICA
| Table[3^n + 6^n, {n, 0, 25}]
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PROG
| (MAGMA) [3^n + 6^n: n in [0..35]]; // Vincenzo Librandi, Apr 30 2011
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CROSSREFS
| Cf. A000051, A034472, A052539, A034474, A062394, A034491, A062395, A062396, A007689, A063376, A063481, A074600 - A074624.
Sequence in context: A088369 A059388 A059392 * A162725 A168431 A036726
Adjacent sequences: A074604 A074605 A074606 * A074608 A074609 A074610
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 25 2002
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