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Search: id:A014901
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| A014901 |
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a(1)=1, a(n)=18*a(n-1)+n. |
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+0
1
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| 1, 20, 363, 6538, 117689, 2118408, 38131351, 686364326, 12354557877, 222382041796, 4002876752339, 72051781542114, 1296932067758065, 23344777219645184, 420205989953613327, 7563707819165039902
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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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]
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MAPLE
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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
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CROSSREFS
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Sequence in context: A060918 A115100 A049683 this_sequence A000564 A019580 A084329
Adjacent sequences: A014898 A014899 A014900 this_sequence A014902 A014903 A014904
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Olivier Gerard (olivier.gerard(AT)gmail.com)
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