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A006661 Number of meanders in which first bridge is 5.
(Formerly M2286)
1
3, 3, 7, 11, 28, 57, 155, 353, 1003, 2458, 7214, 18575, 55880, 149183, 457639, 1255933, 3914103, 10978240, 34663182, 98953078, 315884786, 915008430, 2948378068, 8645874055, 28084475514, 83222134020 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

REFERENCES

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.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=5..30.

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)

CROSSREFS

Cf. A259974, A005316.

Sequence in context: A279987 A279475 A161815 * A068626 A126698 A219211

Adjacent sequences:  A006658 A006659 A006660 * A006662 A006663 A006664

KEYWORD

nonn

AUTHOR

Simon Plouffe

EXTENSIONS

Offset corrected terms a(19)-a(30) added, Andrew Howroyd, Dec 15 2015

STATUS

approved

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Last modified February 16 15:17 EST 2020. Contains 331961 sequences. (Running on oeis4.)