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A046722 Number of semi-meanders of order n with 3 components. 0
1, 3, 11, 37, 126, 430, 1454, 4976, 16880, 57824, 197010, 675428 (list; graph; refs; listen; history; internal format)
OFFSET

3,2

LINKS

P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics.

CROSSREFS

Cf. A000682.

Sequence in context: A192339 A027064 A027066 * A180168 A047102 A109000

Adjacent sequences:  A046719 A046720 A046721 * A046723 A046724 A046725

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.