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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 512 |
| 4 | 3928 |
| 5 | 29808 |
| 6 | 224720 |
| 7 | 1690048 |
| 8 | 12696384 |
| 9 | 95336800 |
| 10 | 715737824 |
| 11 | 5372913760 |
| 12 | 40331981728 |
| 13 | 302748672960 |
| 14 | 2272541936960 |
| 15 | 17058477027072 |
| 16 | 128046595918720 |
| 17 | 961159748107520 |
| 18 | 7214778569757312 |
| 19 | 54156475472054656 |
[8,64,512,3928,29808,224720,1690048,12696384, 95336800,715737824,5372913760,40331981728, 302748672960,2272541936960,17058477027072, 128046595918720,961159748107520,7214778569757312, 54156475472054656] |