Number of ways angles from Pi/n to (n-1)Pi/n can tile around a vertex, where rotations and reflections of an angle sequence are not counted.

A098912

Number of ways angles from Pi/n to (n-1)Pi/n can tile around a vertex, where rotations and reflections of an angle sequence are not counted.

Terms

    a(0) =1a(1) =5a(2) =16a(3) =54a(4) =180a(5) =607a(6) =2098a(7) =7397a(8) =26452a(9) =95821a(10) =350554a(11) =1292634a(12) =4797694a(13) =17904220a(14) =67125898a(15) =252679320a(16) =954505718a(17) =3616951513a(18) =13744169104a(19) =52358244166a(20) =199912298266a(21) =764879838343

External references