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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 918 |
| 3 | 284702 |
| 4 | 86673898 |
| 5 | 25415184702 |
| 6 | 7392392443622 |
| 7 | 2142967506078650 |
| 8 | 620488065801083664 |
| 9 | 179590766393598824048 |
[0,918,284702,86673898,25415184702,7392392443622, 2142967506078650,620488065801083664, 179590766393598824048] |