|
| |
|
|
A002996
|
|
Sum_{k|n} mu(k)*Catalan(n/k) (mu = Moebius function A008683).
(Formerly M3454)
|
|
5
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
REFERENCES
| 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.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
|
LINKS
| T. D. Noe, Table of n, a(n) for n=1..200
|
|
|
CROSSREFS
| Sequence in context: A149339 A149340 A180889 * A076867 A149341 A149342
Adjacent sequences: A002993 A002994 A002995 * A002997 A002998 A002999
|
|
|
KEYWORD
| nonn,easy,nice
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Sep 08 2000
|
| |
|
|
