A098913 - cp's OEIS frontend

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.

n	a(n)
2	1
3	5
4	19
5	75
6	287
7	1053
8	3859
9	14089
10	51463
11	188697
12	695155
13	2573235
14	9571195
15	35759799
16	134154259
17	505163055
18	1908619755
19	7233118641
20	27486768415
21	104713346699
22	399818311219
23	1529747101965
24	5864045590035
25	22517965253595
26	86607619323751
27	333599840675337

[1, 5, 19, 75, 287, 1053, 3859, 14089, 51463, 188697, 695155, 2573235, 9571195, 35759799, 134154259, 505163055, 1908619755, 7233118641, 27486768415, 104713346699, 399818311219, 1529747101965, 5864045590035, 22517965253595, 86607619323751, 333599840675337]

cp's OEIS Frontend

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.

Table of values

List of values