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Search: id:A014901
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A014901 a(1)=1, a(n)=18*a(n-1)+n. +0
1
1, 20, 363, 6538, 117689, 2118408, 38131351, 686364326, 12354557877, 222382041796, 4002876752339, 72051781542114, 1296932067758065, 23344777219645184, 420205989953613327, 7563707819165039902 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n)=-18/289+18/289*18^n-1/17*n, with n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Jan 14 2009]

MAPLE

a:=n->sum((18^(n-j)-1)/17, j=0..n): seq(a(n), n=1..16); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 05 2007

CROSSREFS

Sequence in context: A060918 A115100 A049683 this_sequence A000564 A019580 A084329

Adjacent sequences: A014898 A014899 A014900 this_sequence A014902 A014903 A014904

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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