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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 2925 |
| 4 | 174792640 |
| 5 | 2475588476563125 |
| 6 | 14320984850603177651837856 |
| 7 | 50975600425441237253196072020826978589 |
| 8 | 155681826868802708662507744652859497547627180714885120 |
[1,6,2925,174792640,2475588476563125, 14320984850603177651837856, 50975600425441237253196072020826978589, 15568182686880270866250774465285949754762718071488\ 5120] |