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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 96 |
| 5 | 994 |
| 6 | 15296 |
| 7 | 359844 |
| 8 | 16266632 |
| 9 | 1544277804 |
| 10 | 325993543560 |
[0,1,10,96,994,15296,359844,16266632,1544277804, 325993543560] |