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 A154887 Number of ways to partition n into distinct reduced fractions i/j with j<=n. 3
 1, 2, 11, 71, 838, 7915, 181443 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..7. EXAMPLE a(3) = #{3, 8/3+1/3, 5/2+1/2, 7/3+2/3, 2+1, 2+2/3+1/3, 5/3+4/3, 5/3+1+1/3, 3/2+1+1/2, 3/2+2/3+1/2+1/3, 4/3+1+2/3} = 11. - corrected by Reinhard Zumkeller, Feb 02 2009 CROSSREFS Cf. A154886, A154888, A143270. Sequence in context: A214692 A186633 A291301 * A371518 A363389 A323842 Adjacent sequences: A154884 A154885 A154886 * A154888 A154889 A154890 KEYWORD more,nonn AUTHOR Reinhard Zumkeller, Jan 17 2009 STATUS approved

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Last modified April 23 22:36 EDT 2024. Contains 371917 sequences. (Running on oeis4.)