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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 142 |
| 3 | 4088 |
| 4 | 165576 |
| 5 | 8711752 |
| 6 | 566093104 |
| 7 | 43882188408 |
| 8 | 3957135262720 |
| 9 | 407285038758536 |
| 10 | 47138933615042304 |
| 11 | 6062383519783848952 |
| 12 | 857919091977394542592 |
| 13 | 132511278843714141837000 |
| 14 | 22185703881021997753194496 |
| 15 | 4002648943012304165391154808 |
| 16 | 774212130931445685605345918976 |
[1,8,142,4088,165576,8711752,566093104, 43882188408,3957135262720,407285038758536, 47138933615042304,6062383519783848952, 857919091977394542592,132511278843714141837000, 22185703881021997753194496, 4002648943012304165391154808, 774212130931445685605345918976] |