The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 8 |
| 3 | 310 |
| 4 | 4600 |
| 5 | 695450 |
| 6 | 32209900 |
| 7 | 9441571750 |
| 8 | 1024927826000 |
| 9 | 439344864507250 |
| 10 | 96071120715212500 |
| 11 | 52160549887581638750 |
| 12 | 20873814687864446035000 |
| 13 | 13171711293701017616406250 |
[1,4,8,310,4600,695450,32209900,9441571750, 1024927826000,439344864507250,96071120715212500, 52160549887581638750,20873814687864446035000, 13171711293701017616406250] |