A060148 Number of forest meanders with 2n crossings.

1, 3, 15, 97, 733, 6147, 55541, 530773, 5298723, 54780831, 582817337, 6350647873, 70614662303, 798935833885, 9176290300419, 106793746090045, 1257408517909283, 14958873368871405, 179614516459970349, 2174717049372338913

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 A331325 A132437

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