Number of ways to connect with nonintersecting chords n unlabeled points equally spaced on a circle such that the resulting configuration is not invariant w.r.t. rotation any angle < 2*Pi.
A175955
Number of ways to connect with nonintersecting chords n unlabeled points equally spaced on a circle such that the resulting configuration is not invariant w.r.t. rotation any angle < 2*Pi.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =6a(6) =18a(7) =36a(8) =92a(9) =209a(10) =527a(11) =1269a(12) =3218a(13) =8063a(14) =20701a(15) =53209a(16) =138634a(17) =362789a(18) =957857a(19) =2541735a(20) =6787960a(21) =18214250a(22) =49120018a(23) =133024306a(24) =361736098a(25) =987284765a(26) =2703991469a(27) =7429359867a(28) =20473889132a(29) =56579399002
External references
- oeis: A175955