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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 30 |
| 3 | 438 |
| 4 | 8334 |
| 5 | 194580 |
| 6 | 5368662 |
| 7 | 170591022 |
| 8 | 6126386724 |
| 9 | 245127214548 |
| 10 | 10804866210648 |
| 11 | 519910458588576 |
| 12 | 27105081897342816 |
| 13 | 1521393008601586536 |
| 14 | 91445577404393807928 |
| 15 | 5858664681621903625368 |
| 16 | 398467273528657973600208 |
| 17 | 28668189882264862351707504 |
[1,3,30,438,8334,194580,5368662,170591022, 6126386724,245127214548,10804866210648, 519910458588576,27105081897342816, 1521393008601586536,91445577404393807928, 5858664681621903625368,398467273528657973600208, 28668189882264862351707504] |