Unlabeled (cyclic) Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle, up to rotations of the circle.
A175954
Unlabeled (cyclic) Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle, up to rotations of the circle.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =12a(7) =19a(8) =46a(9) =95a(10) =230a(11) =528a(12) =1320a(13) =3219a(14) =8172a(15) =20714a(16) =53478a(17) =138635a(18) =363486a(19) =957858a(20) =2543476a(21) =6788019a(22) =18218772a(23) =49120019a(24) =133036406a(25) =361736109a(26) =987316658a(27) =2703991820a(28) =7429445752a(29) =20473889133
External references
- oeis: A175954