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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 257 |
| 3 | 1686433 |
| 4 | 110523752704 |
| 5 | 43173450975314176 |
| 6 | 72514862031522895036416 |
| 7 | 418033821374598847702425993216 |
| 8 | 7013444132843374500928464765799366656 |
| 9 | 301905779820559925981495987360836056017534976 |
[0,1,257,1686433,110523752704,43173450975314176, 72514862031522895036416, 418033821374598847702425993216, 7013444132843374500928464765799366656, 301905779820559925981495987360836056017534976] |