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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 322 |
| 4 | 1860498 |
| 5 | 599074578 |
| 6 | 2537720636 |
| 7 | 4721424167835364 |
| 8 | 215002084978043708894524818 |
| 9 | 8784200221406821330636 |
| 10 | 3739702405897758836585154759070350989 |
| 11 | 16342986943522226847837781364 |
[1,2,18,322,1860498,599074578,2537720636, 4721424167835364,215002084978043708894524818, 8784200221406821330636, 3739702405897758836585154759070350989, 16342986943522226847837781364] |