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2, 16, 130, 1072, 8962, 75856, 649090, 5606512, 48811522, 427774096, 3769259650, 33358386352, 296270823682, 2638754838736, 23555015527810, 210638693604592, 1886253119421442, 16909812213653776, 151723048894909570
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| G.f.: 1/(1-7*x)+1/(1-9*x). E.g.f.: e^(7*x)+e^(9*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Jan 11 2009]
a(n)=16*a(n-1)-63*a(n-2) with a(0)=2, a(1)=16 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 21 2010]
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MATHEMATICA
| Table[7^n + 9^n, {n, 0, 20}]
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CROSSREFS
| Cf. A000051, A034472, A052539, A034474, A062394, A034491, A062395, A062396, A007689, A063376, A063481, A074600 - A074624.
Sequence in context: A037720 A022018 A067684 * A002576 A037727 A037622
Adjacent sequences: A074620 A074621 A074622 * A074624 A074625 A074626
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 26 2002
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