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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 83 |
| 4 | 1058 |
| 5 | 15629 |
| 6 | 282381 |
| 7 | 5764807 |
| 8 | 134480900 |
| 9 | 3486902505 |
| 10 | 100048836321 |
| 11 | 3138428376731 |
| 12 | 107006403495850 |
| 13 | 3937376385699301 |
| 14 | 155572843119518781 |
| 15 | 6568408661060858767 |
| 16 | 295150157013526773768 |
| 17 | 14063084452067724991025 |
| 18 | 708236697425777157039381 |
[1,9,83,1058,15629,282381,5764807,134480900, 3486902505,100048836321,3138428376731, 107006403495850,3937376385699301, 155572843119518781,6568408661060858767, 295150157013526773768,14063084452067724991025, 708236697425777157039381] |