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A008828
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Triangle read by rows: T(n,k) = number of closed meander systems of order n with k<=n components.
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10
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1, 2, 2, 8, 12, 5, 42, 84, 56, 14, 262, 640, 580, 240, 42, 1828, 5236, 5894, 3344, 990, 132, 13820, 45164, 60312, 42840, 17472, 4004, 429, 110954, 406012, 624240, 529104, 271240, 85904, 16016, 1430, 933458, 3772008, 6540510, 6413784, 3935238, 1569984, 405552, 63648, 4862
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OFFSET
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1,2
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COMMENTS
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A meander of order n has 2n bridges. For many more references, see A005315 and A005316.
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LINKS
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S. K. Lando and A. K. Zvonkin, Plane and projective meanders, Séries Formelles et Combinatoire Algébrique. Laboratoire Bordelais de Recherche Informatique, Université Bordeaux I, 1991, pp. 287-303. (Annotated scanned copy)
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EXAMPLE
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Triangle starts:
1;
2 2;
8 12 5;
42 84 56 14;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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D. Ivanov, S. K. Lando, A. K. Zvonkin ( LabRI, Bordeaux, France).
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EXTENSIONS
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More terms from Pab Ter (pabrlos(AT)yahoo.com), May 10 2004
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STATUS
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approved
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