Unlabeled Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle.
1, 1, 2, 2, 4, 5, 12, 19, 46, 95, 230, 528, 1320, 3219, 8172, 20714, 53478, 138635
1 seqfan posts
Tue Jan 4 05:30:45 CET 2011 [seqfan] Unlabeled super-Catalan - was unlabeled Motzkin