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A020706
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Pisot sequences L(4,6), E(4,6).
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7
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4, 6, 9, 14, 22, 35, 56, 90, 145, 234, 378, 611, 988, 1598, 2585, 4182, 6766, 10947, 17712, 28658, 46369, 75026, 121394, 196419, 317812, 514230, 832041, 1346270, 2178310, 3524579, 5702888, 9227466, 14930353, 24157818, 39088170, 63245987, 102334156, 165580142
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OFFSET
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0,1
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REFERENCES
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Shalosh B. Ekhad, N. J. A. Sloane and Doron Zeilberger, Automated Proof (or Disproof) of Linear Recurrences Satisfied by Pisot Sequences, Preprint, 2016.
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LINKS
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FORMULA
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a(n) = Fib(n+4)+1 = A000045(n+4)+1.
a(n) = 2a(n-1) - a(n-3).
G.f.: (4-2*x-3*x^2)/(1-x)/(1-x-x^2). - Colin Barker, Feb 21 2012
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MATHEMATICA
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CoefficientList[Series[(4-2*x-3*x^2)/(1-x)/(1-x-x^2), {x, 0, 40}], x](* Vincenzo Librandi, Apr 20 2012 *)
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PROG
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(Magma) I:=[4, 6, 9]; [n le 3 select I[n] else 2*Self(n-1)-Self(n-3): n in [1..40]]; // Vincenzo Librandi, Apr 20 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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