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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 68 |
| 3 | 71586 |
| 4 | 376922368 |
| 5 | 6239545856900 |
| 6 | 251494987671668736 |
| 7 | 20987341985386639351048 |
| 8 | 3241523366830203280698638336 |
| 9 | 853542446596053545575191471030288 |
| 10 | 359842245522349912325804490637312000000 |
[1,68,71586,376922368,6239545856900, 251494987671668736,20987341985386639351048, 3241523366830203280698638336, 853542446596053545575191471030288, 359842245522349912325804490637312000000] |