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Number of ways to partition n into distinct reduced fractions i/j with j <= n.
3

%I #9 Dec 13 2024 09:41:35

%S 1,2,11,71,838,7915,181443,3529287,130501170,4118232210,269279551654,

%T 9556917233108,1003141976524301,74252913818290142,

%U 14979717449141067931,1451159432555957095630,363482056748832080145666,28348494499719127795555178,10422254792015005991605309232

%N Number of ways to partition n into distinct reduced fractions i/j with j <= n.

%e 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

%Y Cf. A143270, A154886, A154888.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Jan 17 2009

%E More terms from _Jinyuan Wang_, Dec 13 2024