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A155588
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a(n) = 5^n + 2^n - 1^n.
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29
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1, 6, 28, 132, 640, 3156, 15688, 78252, 390880, 1953636, 9766648, 48830172, 244144720, 1220711316, 6103532008, 30517610892, 152587956160, 762939584196, 3814697527768, 19073486852412, 95367432689200, 476837160300276
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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..21.
Index entries for linear recurrences with constant coefficients, signature (8,-17,10).
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FORMULA
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G.f.: 1/(1-5*x)+1/(1-2*x)-1/(1-x).
E.g.f.: e^(5*x)+e^(2*x)-e^x.
a(n) = 7*a(n-1)-10*a(n-2)-4 with a(0)=1, a(1)=6. - Vincenzo Librandi, Jul 21 2010
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PROG
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(PARI) a(n)=5^n+2^n-1 \\ Charles R Greathouse IV, Sep 24 2015
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CROSSREFS
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Cf. A074501, A074600, A005057, A005056, A099393.
Sequence in context: A171859 A084778 A287807 * A208439 A108051 A199315
Adjacent sequences: A155585 A155586 A155587 * A155589 A155590 A155591
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KEYWORD
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nonn,easy
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AUTHOR
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Mohammad K. Azarian, Jan 24 2009
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STATUS
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approved
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