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Number of tame meanders with 2n crossings.
9

%I #11 Feb 20 2018 07:40:04

%S 1,3,15,93,657,5063,41535,357205,3187599,29303687,276062807,2654603987

%N Number of tame meanders with 2n crossings.

%H R. Bacher, <a href="https://www-fourier.ujf-grenoble.fr/sites/default/files/ref_478.pdf">Meander algebras</a>, Institut Fourier, UMR 5582, Laboratoire de Mathématiques, 1999.

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

%K nonn,nice,more

%O 1,2

%A _N. J. A. Sloane_, Apr 10 2001

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