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Search: id:A006657
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| A006657 |
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Closed meanders with 2 components and 2n bridges.
(Formerly M2037)
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+0
3
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| 2, 12, 84, 640, 5236, 45164, 406012, 3772008, 35994184, 351173328, 3490681428
(list; graph; listen)
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OFFSET
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2,1
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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.
A column of triangle A008828.
Sequence in context: A092850 A052864 A130464 this_sequence A105927 A052887 A052867
Adjacent sequences: A006654 A006655 A006656 this_sequence A006658 A006659 A006660
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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