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A164094
a(n) = 3*2^n + 2.
4
5, 8, 14, 26, 50, 98, 194, 386, 770, 1538, 3074, 6146, 12290, 24578, 49154, 98306, 196610, 393218, 786434, 1572866, 3145730, 6291458, 12582914, 25165826, 50331650, 100663298, 201326594, 402653186, 805306370, 1610612738, 3221225474
OFFSET
0,1
FORMULA
a(n) = A007283(n) + 2 = 3*a(n-1) - 2*a(n-2).
G.f.: (5-7*x)/((2*x-1)*(x-1)).
MATHEMATICA
#+2&/@(3 2^Range[0, 30]) (* Harvey P. Dale, Jan 23 2011 *)
PROG
(PARI) a(n)= 3<<n+2 \\ Charles R Greathouse IV, Jan 11 2012
CROSSREFS
Cf. A007283.
Sequence in context: A101835 A192522 A133641 * A246319 A302649 A286835
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 10 2009
EXTENSIONS
Offset corrected by R. J. Mathar, Aug 21 2009
STATUS
approved