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Search: id:A134931
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| A134931 |
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a(0)=1; a(n)=3*(a(n-1)+1). |
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+0
9
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| 1, 6, 21, 66, 201, 606, 1821, 5466, 16401, 49206, 147621, 442866, 1328601, 3985806, 11957421, 35872266, 107616801, 322850406, 968551221, 2905653666, 8716961001, 26150883006, 78452649021, 235357947066, 706073841201, 2118221523606
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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O.g.f.: -5/2/(-1+3*x)+3/2/(-1+x). a(n) = [A005030(n)-3]/2. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 31 2008
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MATHEMATICA
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a=1; lst={a}; Do[a=a*3+3; AppendTo[lst, a], {n, 0, 3*4!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 25 2008]
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CROSSREFS
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Adjacent sequences: A134928 A134929 A134930 this_sequence A134932 A134933 A134934
Sequence in context: A022571 A117962 A105457 this_sequence A119103 A107653 A123653
Cf. A003462, A007051, A034472, A024023, A067771, A029858 [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 25 2008]
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KEYWORD
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nonn,new
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AUTHOR
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Rolf Pleisch (r_pleisch(AT)gmx.ch), Jan 29 2008
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EXTENSIONS
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More terms and Mathematica program Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 25 2008
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