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Search: id:A144756
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| 1, 3, 33, 627, 16929, 592515, 25478145, 1299385395, 76663738305, 5136470466435, 385235284982625, 3197452865355785, 2909682107473766625, 288058528639902895875, 30822262564469609858625
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=Sum_{k=0..n}A132393(n,k)*3^k*8^(n-k).
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EXAMPLE
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a(0)=1, a(1)=3, a(2)=3*11=33, a(3)=3*11*19=627, a(4)=3*11*19*27=16929, ...
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MATHEMATICA
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s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 2, 5!, 8}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Cf. A001710, A001147, A032031, A008545, A047056, A011781, A144739,
Sequence in context: A083080 A002916 A009659 this_sequence A003715 A009690 A124432
Adjacent sequences: A144753 A144754 A144755 this_sequence A144757 A144758 A144759
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 20 2008
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