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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 728 |
| 3 | 37320 |
| 4 | 2226936 |
| 5 | 128171936 |
| 6 | 7444342896 |
| 7 | 431408410784 |
| 8 | 25014514225856 |
| 9 | 1450226501771584 |
| 10 | 84080327982982848 |
| 11 | 4874715696405194752 |
| 12 | 282621433306639435392 |
| 13 | 16385536749696632356608 |
| 14 | 949984033027704106955264 |
| 15 | 55077209132605857634211328 |
[1,8,728,37320,2226936,128171936,7444342896, 431408410784,25014514225856,1450226501771584, 84080327982982848,4874715696405194752, 282621433306639435392,16385536749696632356608, 949984033027704106955264, 55077209132605857634211328] |