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| n | a(n) |
|---|---|
| 0 | 18 |
| 1 | 24 |
| 2 | 432 |
| 3 | 10368 |
| 4 | 4478976 |
| 5 | 46438023168 |
| 6 | 207994791256915968 |
| 7 | 9658866935211987562213146624 |
| 8 | 2008994011967745042140303999261186371230892032 |
[18,24,432,10368,4478976,46438023168, 207994791256915968,9658866935211987562213146624, 2008994011967745042140303999261186371230892032] |