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Search: id:A158749
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A158749 n*9^n. +0
1
0, 9, 162, 2187, 26244, 295245, 3188646, 33480783, 344373768, 3486784401, 34867844010, 345191655699, 3389154437772, 33044255768277, 320275094369454, 3088366981419735, 29648323021629456, 283512088894331673 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n) =n*9^n.

a(n)=18*a(n-1)-81*a(n-2) = A038299(n,1). G.f.: 9x/(1-9x)^2. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 26 2009]

a(n) = A001019(n)*n. [From Omar E. Pol (info(AT)polprimos.com), Mar 26 2009]

MAPLE

with(finance):seq(futurevalue(n, 8 , n), n=0..18); #

CROSSREFS

A036289 A036290 A018215 A036291 A036292 A036293 A036294 A126431

Cf. A001019. [From Omar E. Pol (info(AT)polprimos.com), Mar 26 2009]

Sequence in context: A159831 A133793 A084874 this_sequence A133681 A157553 A156273

Adjacent sequences: A158746 A158747 A158748 this_sequence A158750 A158751 A158752

KEYWORD

nonn

AUTHOR

Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 25 2009

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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