Number of different ways angles from Pi/n to (n-1)Pi/n can tile around a vertex, where rotations of an angle sequence are not counted, but reflections that are different are counted.
A098913
Number of different ways angles from Pi/n to (n-1)Pi/n can tile around a vertex, where rotations of an angle sequence are not counted, but reflections that are different are counted.
Terms
- a(0) =1a(1) =5a(2) =19a(3) =75a(4) =287a(5) =1053a(6) =3859a(7) =14089a(8) =51463a(9) =188697a(10) =695155a(11) =2573235a(12) =9571195a(13) =35759799a(14) =134154259a(15) =505163055a(16) =1908619755a(17) =7233118641a(18) =27486768415a(19) =104713346699a(20) =399818311219
External references
- oeis: A098913