Dihedral unlabeled Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle, up to rotations and reflections of the circle.
A185100
Dihedral unlabeled Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle, up to rotations and reflections of the circle.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =11a(7) =16a(8) =36a(9) =65a(10) =150a(11) =312a(12) =756a(13) =1743a(14) =4353a(15) =10732a(16) =27489a(17) =70379a(18) =183866a(19) =481952a(20) =1277784a(21) =3402661a(22) =9126689a(23) =24584870a(24) =66567924a(25) =180939737a(26) =493801694a(27) =1352203202a(28) =3715137460a(29) =10237545525
External references
- oeis: A185100