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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 56640 |
| 3 | 56055960 |
| 4 | 76385030400 |
| 5 | 124672148625000 |
| 6 | 228479027903507520 |
| 7 | 453922725503344566840 |
| 8 | 957089306644111555200000 |
| 9 | 2112293133628003412534448000 |
| 10 | 4833477575790121928875488600000 |
[120,56640,56055960,76385030400,124672148625000, 228479027903507520,453922725503344566840, 957089306644111555200000, 2112293133628003412534448000, 4833477575790121928875488600000] |