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A074504
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1^n + 2^n + 8^n.
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0
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3, 11, 69, 521, 4113, 32801, 262209, 2097281, 16777473, 134218241, 1073742849, 8589936641, 68719480833, 549755822081, 4398046527489, 35184372121601, 281474976776193, 2251799813816321, 18014398509744129, 144115188076380161
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| G.f.: 1/(1-x)+1/(1-2*x)+1/(1-8*x). E.g.f.: e^x+e^(2*x)+e^(8*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Dec 26 2008]
a(n)=10*a(n-1)-16*a(n-2)+7 with a(0)=3, a(1)=11 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 21 2010]
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MATHEMATICA
| Table[1^n + 2^n + 8^n, {n, 0, 20}]
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CROSSREFS
| Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
Sequence in context: A173235 A201259 A177008 * A126115 A018193 A121945
Adjacent sequences: A074501 A074502 A074503 * A074505 A074506 A074507
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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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