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A046721 Number of semi-meanders of order n with 2 components. 0
1, 2, 6, 16, 48, 140, 428, 1308, 4072, 12796, 40432, 129432, 413900 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

LINKS

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

CROSSREFS

Cf. A000682.

Sequence in context: A151281 A045694 A129772 * A151528 A132803 A079565

Adjacent sequences:  A046718 A046719 A046720 * A046722 A046723 A046724

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 09:50 EST 2012. Contains 205904 sequences.