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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 9 |
| 3 | 31 |
| 4 | 975 |
| 5 | 297097 |
| 6 | 816867 |
| 7 | 4148165871 |
| 8 | 152488124529 |
| 9 | 1632977901693 |
| 10 | 11162529166917 |
| 11 | 11925833175477 |
| 12 | 3047549778123957 |
| 13 | 3894487365191355 |
| 14 | 8920885515768255 |
[0,9,31,975,297097,816867,4148165871,152488124529, 1632977901693,11162529166917,11925833175477, 3047549778123957,3894487365191355, 8920885515768255] |