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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 630 |
| 2 | 3153150 |
| 3 | 22813670880 |
| 4 | 193806353490750 |
| 5 | 1802031190366286880 |
| 6 | 17755578493589035663200 |
| 7 | 182158430416168427065152000 |
| 8 | 1925260201766867818810402194750 |
| 9 | 20818566865288816646328596337547500 |
| 10 | 229228257016837202266078995839014634400 |
| 11 | 2561300570236102532082971119182538320480000 |
[1,630,3153150,22813670880,193806353490750, 1802031190366286880,17755578493589035663200, 182158430416168427065152000, 1925260201766867818810402194750, 20818566865288816646328596337547500, 229228257016837202266078995839014634400, 2561300570236102532082971119182538320480000] |