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A006658
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Closed meanders with 3 components and 2n bridges.
(Formerly M4014)
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1
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OFFSET
| 3,1
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REFERENCES
| S. K. Lando and A. K. Zvonkin "Plane and projective meanders", S\'{e}ries Formelles et Combinatoire Alg\'{e}brique. Laboratoire Bordelais de Recherche Informatique, Universit\'{e} Bordeaux I, 1991, pp. 287-303.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics.
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CROSSREFS
| Cf. A005315, A006657.
A column of triangle A008828.
Sequence in context: A030060 A174249 A073563 * A006293 A132618 A192562
Adjacent sequences: A006655 A006656 A006657 * A006659 A006660 A006661
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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