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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 13440 |
| 4 | 14175 |
| 5 | 4963587213865915514880 |
| 6 | 28028000 |
| 7 | 738615790595351500616546025309298211371540807680000000000 |
| 8 | 18172761476738086968750 |
| 9 | 52650499032325167909847642931200000000 |
[1,6,13440,14175,4963587213865915514880,28028000, 73861579059535150061654602530929821137154080768000\ 0000000,18172761476738086968750, 52650499032325167909847642931200000000] |