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A046725 Number of semi-meanders of order n with 6 components. 2
1, 6, 32, 152, 690, 3028, 12996, 54812, 228284, 939148, 3833076, 15487428, 62244564, 247973928, 984221764, 3876113404, 15223550024, 59379645924, 231124139318, 894157177372, 3453279084296, 13266154255196, 50886266714598, 194294744477756, 740816697816046 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 6..40

P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics, arXiv:hep-th/9506030, 1995.

CROSSREFS

Cf. A000682, A046726.

Sequence in context: A121333 A243026 A242542 * A232331 A231992 A292044

Adjacent sequences:  A046722 A046723 A046724 * A046726 A046727 A046728

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(15)-a(40) from Andrew Howroyd, Dec 07 2015

STATUS

approved

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Last modified October 19 21:28 EDT 2019. Contains 328244 sequences. (Running on oeis4.)