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A006663
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Number of projective meanders.
(Formerly M0374)
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0
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1, 1, 2, 2, 8, 12, 52, 86, 400, 710, 3404, 6316, 30888, 59204, 293192, 576018
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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REFERENCES
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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
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Table of n, a(n) for n=0..15.
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CROSSREFS
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Sequence in context: A087955 A026537 A089248 * A094941 A002785 A045686
Adjacent sequences: A006660 A006661 A006662 * A006664 A006665 A006666
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane, Simon Plouffe
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STATUS
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approved
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