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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 49500 |
| 3 | 55480000 |
| 4 | 75108093750 |
| 5 | 124667171985024 |
| 6 | 226899085942554400 |
| 7 | 453922674315047424000 |
| 8 | 954267187464733528198125 |
| 9 | 2112236210012497151219800000 |
| 10 | 4825706564405954731805322783552 |
[120,49500,55480000,75108093750,124667171985024, 226899085942554400,453922674315047424000, 954267187464733528198125, 2112236210012497151219800000, 4825706564405954731805322783552] |