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A198645
a(n) = 10*3^n - 1.
3
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
OFFSET
0,1
FORMULA
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
MATHEMATICA
10 * 3^Range[0, 30]-1 (* Harvey P. Dale, Feb 28 2022 *)
PROG
(Magma) [10*3^n-1: n in [0..30]]
CROSSREFS
Cf. A048473.
Sequence in context: A318742 A024922 A193004 * A045862 A035075 A103535
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 28 2011
STATUS
approved