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Search: id:A002996
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| A002996 |
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Sum_{k|n} mu(k)*Catalan(n/k) (mu = Moebius function A008683).
(Formerly M3454)
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+0
2
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| 1, 1, 4, 12, 41, 126, 428, 1416, 4857, 16753, 58785, 207868, 742899, 2674010, 9694799, 35356240, 129644789, 477633711, 1767263189, 6564103612, 24466266587, 91482504853, 343059613649, 1289903937896, 4861946401410
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
A. Errara, Analysis situs: une probleme d'enumeration, Memoires Acad. Bruxelles, Series 2, Vol. 11, No. 6, 26pp.
A. Errara, De quelques problemes d'analysis situs, Comptes Rend. Congr. Nat. Sci. Bruxelles, (1930), 106-110.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..200
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CROSSREFS
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Adjacent sequences: A002993 A002994 A002995 this_sequence A002997 A002998 A002999
Sequence in context: A149338 A149339 A149340 this_sequence A076867 A149341 A149342
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KEYWORD
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nonn,easy,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Sep 08 2000
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