| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 12 |
| 4 | 56 |
| 5 | 471 |
| 6 | 4689 |
| 7 | 44186 |
| 8 | 522001 |
| 9 | 5379458 |
| 10 | 62969638 |
| 11 | 689301117 |
| 12 | 7995632432 |
| 13 | 89669878606 |
| 14 | 1030894396261 |
| 15 | 11694235466700 |
| 16 | 133810754113662 |
| 17 | 1523947269885410 |
| 18 | 17410346219635865 |
| 19 | 198543925466100523 |
[0,8,12,56,471,4689,44186,522001,5379458,62969638, 689301117,7995632432,89669878606,1030894396261, 11694235466700,133810754113662,1523947269885410, 17410346219635865,198543925466100523] |