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Search: id:A046879
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| A046879 |
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Denominator of 1/n Sum[ 1/BinomialCoefficient[ n-1,k ], {k,0,n-1} ]. |
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+0
4
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| 1, 1, 1, 6, 3, 15, 30, 420, 105, 315, 315, 6930, 3465, 90090, 180180, 72072, 9009, 153153, 153153, 5819814, 14549535, 14549535, 29099070, 1338557220, 334639305, 1673196525, 1673196525, 10039179150, 10039179150, 582272390700, 1164544781400
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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for n>=1 a(n) is the Denominator of (1/2^n)*Sum(2^k/k,k=1..n) [From Groux Roland (roland.groux(AT)orange.fr), Jan 13 2009]
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..200
Eric Weisstein's World of Mathematics, Leibniz Harmonic Triangle
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CROSSREFS
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See A046825, the main entry for this sequence. Cf. A046878.
Sequence in context: A049784 A097917 A116570 this_sequence A067990 A050008 A166450
Adjacent sequences: A046876 A046877 A046878 this_sequence A046880 A046881 A046882
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KEYWORD
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nonn,frac,easy,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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