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A198644 8*3^n-1. 3
7, 23, 71, 215, 647, 1943, 5831, 17495, 52487, 157463, 472391, 1417175, 4251527, 12754583, 38263751, 114791255, 344373767, 1033121303, 3099363911, 9298091735, 27894275207, 83682825623, 251048476871, 753145430615, 2259436291847, 6778308875543 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
a(n) = 3*a(n-1)+2, a(0)=7.
G.f. ( 7-5*x ) / ( (3*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011
PROG
(Magma) [8*3^n-1: n in [0..30]]
CROSSREFS
Sequence in context: A005342 A139852 A141194 * A045535 A001984 A147972
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 28 2011
STATUS
approved

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Last modified February 24 05:58 EST 2024. Contains 370294 sequences. (Running on oeis4.)