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A206422
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Fibonacci sequence beginning 11, 9.
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1
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11, 9, 20, 29, 49, 78, 127, 205, 332, 537, 869, 1406, 2275, 3681, 5956, 9637, 15593, 25230, 40823, 66053, 106876, 172929, 279805, 452734, 732539, 1185273, 1917812, 3103085, 5020897, 8123982, 13144879, 21268861, 34413740, 55682601, 90096341, 145778942
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = a(n-1) + a(n-2) for n > 2.
a(n) = 11*Fibonacci(n) - 2*Fibonacci(n-1).
G.f.: x*(11 - 2*x)/(1 - x - x^2). (End)
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MATHEMATICA
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LinearRecurrence[{1, 1}, {11, 9}, 60]
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PROG
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(Magma) I:=[11, 9]; [n le 2 select I[n] else Self(n-1)+ Self(n-2): n in [1..40]]; \\ Vincenzo Librandi, Feb 18 2012
(PARI) Vec((11 - 2*x)/(1 - x - x^2) + O(x^30)) \\ Andrew Howroyd, Aug 28 2018
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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STATUS
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approved
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