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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 87 |
| 4 | 1100 |
| 5 | 15173 |
| 6 | 221449 |
| 7 | 3362472 |
| 8 | 52571486 |
| 9 | 840658030 |
| 10 | 13685005046 |
| 11 | 226034078091 |
| 12 | 3778561589470 |
| 13 | 63808500324629 |
| 14 | 1086892630726300 |
| 15 | 18652582726212792 |
| 16 | 322197108441548095 |
| 17 | 5597514211552503858 |
| 18 | 97741241871353705160 |
| 19 | 1714482398765781043424 |
[1,1,8,87,1100,15173,221449,3362472,52571486, 840658030,13685005046,226034078091,3778561589470, 63808500324629,1086892630726300,18652582726212792, 322197108441548095,5597514211552503858, 97741241871353705160,1714482398765781043424] |