The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 80 |
| 4 | 3778 |
| 5 | 1742881 |
| 6 | 2546661201 |
| 7 | 16353452350876 |
| 8 | 411980921235969243 |
[1,1,80,3778,1742881,2546661201,16353452350876, 411980921235969243] |