The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 616 |
| 3 | 1953098 |
| 4 | 152587890544 |
| 5 | 298023223876952882 |
| 6 | 14551915228366851806639896 |
| 7 | 17763568394002504646778106689450938 |
| 8 | 542101086242752217003726400434970855712884064 |
[0,2,616,1953098,152587890544,298023223876952882, 14551915228366851806639896, 17763568394002504646778106689450938, 542101086242752217003726400434970855712884064] |