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Search: id:A006658
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| A006658 |
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Closed meanders with 3 components and 2n bridges.
(Formerly M4014)
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+0
2
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| 5, 56, 580, 5894, 60312, 624240, 6540510, 69323910, 742518832, 8028001566
(list; graph; listen)
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OFFSET
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3,1
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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).
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.
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LINKS
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P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics.
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CROSSREFS
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Cf. A005315, A006657.
A column of triangle A008828.
Sequence in context: A062125 A030060 A073563 this_sequence A006293 A132618 A060080
Adjacent sequences: A006655 A006656 A006657 this_sequence A006659 A006660 A006661
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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