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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 120 |
| 4 | 193573 |
| 5 | 1380339980 |
| 6 | 35157552997320 |
| 7 | 2707357478410889115 |
| 8 | 555249505892003620997475 |
| 9 | 274283912325835718446290655176 |
| 10 | 300690927870900038104809199886390475 |
[0,1,120,193573,1380339980,35157552997320, 2707357478410889115,555249505892003620997475, 274283912325835718446290655176, 300690927870900038104809199886390475] |