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A060148 Number of forest meanders with 2n crossings. 8
1, 3, 15, 97, 733, 6147, 55541, 530773, 5298723, 54780831, 582817337, 6350647873, 70614662303, 798935833885, 9176290300419, 106793746090045, 1257408517909283, 14958873368871405, 179614516459970349, 2174717049372338913 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A forest meander system is a meander system that does not have any components which are entirely enclosed by another. - Andrew Howroyd, Nov 22 2015

LINKS

Table of n, a(n) for n=1..20.

R. Bacher, Meander algebras

CROSSREFS

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

Sequence in context: A262751 A231445 A108442 * A143435 A132437 A128081

Adjacent sequences:  A060145 A060146 A060147 * A060149 A060150 A060151

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane, Apr 10 2001

EXTENSIONS

More terms from Sascha Kurz, Mar 25 2002

a(15)-a(20) from Andrew Howroyd, Nov 22 2015

STATUS

approved

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Last modified December 15 20:00 EST 2019. Contains 330000 sequences. (Running on oeis4.)