| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 70 |
| 3 | 12282 |
| 4 | 20383931 |
| 5 | 337547720906 |
| 6 | 59996420905835268 |
| 7 | 121724323699826555003445 |
| 8 | 2953782468893892488974599595107 |
[4,70,12282,20383931,337547720906, 59996420905835268,121724323699826555003445, 2953782468893892488974599595107] |