The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 5 |
| 4 | 8 |
| 5 | 21 |
| 6 | 175 |
| 7 | 1984 |
| 8 | 27783 |
| 9 | 566775 |
| 10 | 18973984 |
| 11 | 977497059 |
| 12 | 72692403175 |
| 13 | 7984795118976 |
| 14 | 1348773682858701 |
| 15 | 345874419612107295 |
| 16 | 131649476800621708800 |
| 17 | 74856171576736831201899 |
[1,5,8,21,175,1984,27783,566775,18973984, 977497059,72692403175,7984795118976, 1348773682858701,345874419612107295, 131649476800621708800,74856171576736831201899] |