The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 105 |
| 4 | 2366 |
| 5 | 68776 |
| 6 | 2390230 |
| 7 | 95166058 |
| 8 | 4228436480 |
| 9 | 206090296497 |
| 10 | 10887958126763 |
| 11 | 618187895371965 |
| 12 | 37479711430699245 |
| 13 | 2414492049517400164 |
| 14 | 164626564026042206780 |
| 15 | 11841796830661101527618 |
| 16 | 896184803460067359995232 |
| 17 | 71189783172592806474895908 |
[1,1,7,105,2366,68776,2390230,95166058,4228436480, 206090296497,10887958126763,618187895371965, 37479711430699245,2414492049517400164, 164626564026042206780,11841796830661101527618, 896184803460067359995232, 71189783172592806474895908] |