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1, 7, 61, 505, 4081, 32737, 262081, 2097025, 16776961, 134217217, 1073740801, 8589932545, 68719472641, 549755805697, 4398046494721, 35184372056065, 281474976645121, 2251799813554177, 18014398509219841, 144115188075331585
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..19.
Index entries for linear recurrences with constant coefficients, signature (11,-26,16).
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FORMULA
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G.f.: 1/(1-8*x)-1/(1-2*x)+1/(1-x). E.g.f.: e^(8*x)-e^(2*x)+e^x.
a(n)=10*a(n-1)-16*a(n-2)+7 with a(0)=1, a(1)=7 - Vincenzo Librandi, Jul 21 2010
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MATHEMATICA
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Table[8^n-2^n+1, {n, 0, 30}] (* or *) LinearRecurrence[{11, -26, 16}, {1, 7, 61}, 30] (* Harvey P. Dale, Feb 25 2014 *)
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PROG
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(PARI) a(n)=8^n-2^n+1 \\ Charles R Greathouse IV, Sep 24 2015
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CROSSREFS
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Cf. A074501, A020515, A155588, A155590, A155592, A155593, A155594, A155596, A155597, A155598.
Sequence in context: A218805 A164943 A218228 * A104093 A015572 A066443
Adjacent sequences: A155596 A155597 A155598 * A155600 A155601 A155602
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KEYWORD
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nonn,easy
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AUTHOR
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Mohammad K. Azarian, Jan 25 2009
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STATUS
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approved
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