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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 512 |
| 4 | 3375 |
| 5 | 21952 |
| 6 | 140608 |
| 7 | 912673 |
| 8 | 5929741 |
| 9 | 38614472 |
| 10 | 251239591 |
| 11 | 1634691752 |
| 12 | 10633486599 |
| 13 | 69173457625 |
| 14 | 449983383247 |
| 15 | 2927275422625 |
| 16 | 19042718961664 |
| 17 | 123878371625000 |
| 18 | 805862864751112 |
| 19 | 5242361459792813 |
| 20 | 34103003909455872 |
[8,64,512,3375,21952,140608,912673,5929741, 38614472,251239591,1634691752,10633486599, 69173457625,449983383247,2927275422625, 19042718961664,123878371625000,805862864751112, 5242361459792813,34103003909455872] |