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A198643 a(n) = 5*3^n-1. 6
4, 14, 44, 134, 404, 1214, 3644, 10934, 32804, 98414, 295244, 885734, 2657204, 7971614, 23914844, 71744534, 215233604, 645700814, 1937102444, 5811307334, 17433922004, 52301766014, 156905298044, 470715894134, 1412147682404, 4236443047214 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
a(n) = 3*a(n-1)+2 = 2*A060816(n+1).
G.f.: ( 4-2*x ) / ( (3*x-1)*(x-1) ). - R. J. Mathar, Nov 17 2011
PROG
(Magma) [5*3^n-1: n in [0..30]]
(PARI) a(n)=5*3^n-1 \\ Charles R Greathouse IV, Oct 07 2015
CROSSREFS
Sequence in context: A027831 A097894 A065835 * A097137 A083377 A047115
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 28 2011
STATUS
approved

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Last modified March 1 20:05 EST 2024. Contains 370443 sequences. (Running on oeis4.)