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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 120 |
| 3 | 23448 |
| 4 | 13177740 |
| 5 | 25162747992 |
| 6 | 176610474548304 |
| 7 | 4757551848002860896 |
| 8 | 504235830402554520290820 |
| 9 | 213082697840230591135069403580 |
[0,120,23448,13177740,25162747992,176610474548304, 4757551848002860896,504235830402554520290820, 213082697840230591135069403580] |