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A090732
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a(n) = 24a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 24.
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2
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2, 24, 574, 13752, 329474, 7893624, 189117502, 4530926424, 108553116674, 2600743873752, 62309299853374, 1492822452607224, 35765429562720002, 856877487052672824, 20529294259701427774, 491846184745781593752
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OFFSET
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0,1
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LINKS
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Indranil Ghosh, Table of n, a(n) for n = 0..723
Tanya Khovanova, Recursive Sequences
Index entries for recurrences a(n) = k*a(n - 1) +/- a(n - 2)
Index entries for linear recurrences with constant coefficients, signature (24,-1).
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FORMULA
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a(n) = p^n + q^n, where p = 12 + sqrt(143) and q = 12 - sqrt(143). - Tanya Khovanova, Feb 06 2007
G.f.: (2-24*x)/(1-24*x+x^2). - Philippe Deléham, Nov 02 2008
a(n)=2*A077424(n). - R. J. Mathar, Sep 27 2014
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MATHEMATICA
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a[0] = 2; a[1] = 24; a[n_] := 24a[n - 1] - a[n - 2]; Table[ a[n], {n, 0, 15}] (* Robert G. Wilson v, Jan 30 2004 *)
LinearRecurrence[{24, -1}, {2, 24}, 30] (* Harvey P. Dale, Sep 19 2011 *)
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PROG
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(Sage) [lucas_number2(n, 24, 1) for n in xrange(0, 20)] # Zerinvary Lajos, Jun 26 2008
(PARI) a(n)=([0, 1; -1, 24]^n*[2; 24])[1, 1] \\ Charles R Greathouse IV, Feb 07 2017
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CROSSREFS
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Cf. A056949, A077424.
Sequence in context: A012113 A156525 A170904 * A014298 A280794 A090316
Adjacent sequences: A090729 A090730 A090731 * A090733 A090734 A090735
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KEYWORD
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easy,nonn
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AUTHOR
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Nikolay V. Kosinov (kosinov(AT)unitron.com.ua), Jan 18 2004
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STATUS
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approved
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