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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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6
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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; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| 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
| 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
| See A046825, the main entry for this sequence. Cf. A046878.
Sequence in context: A049784 A097917 A116570 * A067990 A174012 A050008
Adjacent sequences: A046876 A046877 A046878 * A046880 A046881 A046882
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KEYWORD
| nonn,frac,easy,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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