Search: id:A002996
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%I A002996 M3454
%S A002996 1,1,4,12,41,126,428,1416,4857,16753,58785,207868,742899,2674010,
%T A002996 9694799,35356240,129644789,477633711,1767263189,6564103612,
%U A002996 24466266587,91482504853,343059613649,1289903937896,4861946401410
%N A002996 Sum_{k|n} mu(k)*Catalan(n/k) (mu = Moebius function A008683).
%D A002996 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002996 A. Errara, Analysis situs: une probleme d'enumeration, Memoires Acad. 
               Bruxelles, Series 2, Vol. 11, No. 6, 26pp.
%D A002996 A. Errara, De quelques problemes d'analysis situs, Comptes Rend. Congr. 
               Nat. Sci. Bruxelles, (1930), 106-110.
%H A002996 T. D. Noe, <a href="b002996.txt">Table of n, a(n) for n=1..200</a>
%Y A002996 Sequence in context: A149338 A149339 A149340 this_sequence A076867 A149341 
               A149342
%Y A002996 Adjacent sequences: A002993 A002994 A002995 this_sequence A002997 A002998 
               A002999
%K A002996 nonn,easy,nice
%O A002996 1,3
%A A002996 N. J. A. Sloane (njas(AT)research.att.com).
%E A002996 More terms from James A. Sellers (sellersj(AT)math.psu.edu), Sep 08 2000

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