| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 58 |
| 3 | 444 |
| 4 | 3358 |
| 5 | 26256 |
| 6 | 203496 |
| 7 | 1606524 |
| 8 | 12610616 |
| 9 | 98974880 |
| 10 | 777361848 |
| 11 | 6111929616 |
| 12 | 48109349232 |
| 13 | 379117702232 |
| 14 | 2990823713232 |
| 15 | 23618400643440 |
| 16 | 186690033943144 |
| 17 | 1476967053450912 |
| 18 | 11694155696863040 |
| 19 | 92658793731655808 |
[8,58,444,3358,26256,203496,1606524,12610616, 98974880,777361848,6111929616,48109349232, 379117702232,2990823713232,23618400643440, 186690033943144,1476967053450912, 11694155696863040,92658793731655808] |