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A198645
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a(n) = 10*3^n - 1.
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3
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9, 29, 89, 269, 809, 2429, 7289, 21869, 65609, 196829, 590489, 1771469, 5314409, 15943229, 47829689, 143489069, 430467209, 1291401629, 3874204889, 11622614669, 34867844009, 104603532029, 313810596089, 941431788269, 2824295364809
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OFFSET
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0,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (4,-3).
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FORMULA
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a(n) = 3*a(n-1) + 2, a(0)=9.
G.f. ( 9-7*x ) / ( (3*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011
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MATHEMATICA
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10 * 3^Range[0, 30]-1 (* Harvey P. Dale, Feb 28 2022 *)
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PROG
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(Magma) [10*3^n-1: n in [0..30]]
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CROSSREFS
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Cf. A048473.
Sequence in context: A318742 A024922 A193004 * A045862 A035075 A103535
Adjacent sequences: A198642 A198643 A198644 * A198646 A198647 A198648
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Oct 28 2011
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STATUS
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approved
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