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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 258 |
| 5 | 7406 |
| 6 | 442668 |
| 7 | 54371100 |
| 8 | 13585980916 |
| 9 | 6859762797636 |
| 10 | 6969135518632452 |
| 11 | 14209819222900305044 |
| 12 | 58061006907633910998660 |
| 13 | 474996314819118381967232244 |
| 14 | 7776635831062534849079443379908 |
| 15 | 254723669580125156112963535996038036 |
[1,1,3,19,258,7406,442668,54371100,13585980916, 6859762797636,6969135518632452, 14209819222900305044,58061006907633910998660, 474996314819118381967232244, 7776635831062534849079443379908, 254723669580125156112963535996038036] |