The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 66 |
| 3 | 2106 |
| 4 | 320970 |
| 5 | 43853402 |
| 6 | 36695929036 |
| 7 | 26681634560690 |
| 8 | 121531720205091748 |
| 9 | 479398570293769095556 |
| 10 | 11869733818244916838154264 |
[2,66,2106,320970,43853402,36695929036, 26681634560690,121531720205091748, 479398570293769095556,11869733818244916838154264] |