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A060066 Number of tame meanders with 2n crossings. 9
1, 3, 15, 93, 657, 5063, 41535, 357205, 3187599, 29303687, 276062807, 2654603987 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

R. Bacher, Meander algebras, Institut Fourier, UMR 5582, Laboratoire de Mathématiques, 1999.

CROSSREFS

Meander sequences in Bacher's paper: A005315, A060066, A060089, A060111, A060148, A060149, A060174, A060198, A060206.

Sequence in context: A074539 A103210 A203014 * A206177 A272230 A308457

Adjacent sequences:  A060063 A060064 A060065 * A060067 A060068 A060069

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane, Apr 10 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Apr 26 2001

STATUS

approved

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Last modified November 14 04:56 EST 2019. Contains 329110 sequences. (Running on oeis4.)