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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 400 |
| 3 | 960400 |
| 4 | 54218191104 |
| 5 | 71410553858811024 |
| 6 | 2186315392560559723530496 |
| 7 | 1552832545847343203950118294425600 |
| 8 | 25554649541466337940020968722797075170918400 |
| 9 | 9736551559782513812975251884508283964266367033264640000 |
[1,4,400,960400,54218191104,71410553858811024, 2186315392560559723530496, 1552832545847343203950118294425600, 25554649541466337940020968722797075170918400, 97365515597825138129752518845082839642663670332646\ 40000] |