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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 847 |
| 4 | 19326 |
| 5 | 293814 |
| 6 | 3714629 |
| 7 | 42265965 |
| 8 | 449985840 |
| 9 | 4571830360 |
| 10 | 44873281735 |
| 11 | 428836383879 |
| 12 | 4011945910730 |
| 13 | 36886705974618 |
| 14 | 334269681986457 |
| 15 | 2992281836910513 |
| 16 | 26505969364372244 |
| 17 | 232662102182106796 |
[0,6,847,19326,293814,3714629,42265965,449985840, 4571830360,44873281735,428836383879,4011945910730, 36886705974618,334269681986457,2992281836910513, 26505969364372244,232662102182106796] |