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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 81 |
| 4 | 225280 |
| 5 | 7991790625 |
| 6 | 1078848154238976 |
| 7 | 65180706714634067542224001 |
| 8 | 1650157594512930366268925848349310976 |
| 9 | 66807065275536807794426016376688705273224158387201 |
[0,0,0,81,225280,7991790625,1078848154238976, 65180706714634067542224001, 1650157594512930366268925848349310976, 66807065275536807794426016376688705273224158387201\ ] |