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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 61 |
| 3 | 639 |
| 4 | 7825 |
| 5 | 109683 |
| 6 | 1731645 |
| 7 | 30403495 |
| 8 | 587595649 |
| 9 | 12395233539 |
| 10 | 283385424829 |
| 11 | 6979650164391 |
| 12 | 184235963026833 |
| 13 | 5188528445210035 |
| 14 | 155284012799863453 |
| 15 | 4921569063327156807 |
| 16 | 164672737994453759617 |
| 17 | 5800532536265417597571 |
| 18 | 214559605389429001486557 |
[1,7,61,639,7825,109683,1731645,30403495, 587595649,12395233539,283385424829,6979650164391, 184235963026833,5188528445210035, 155284012799863453,4921569063327156807, 164672737994453759617,5800532536265417597571, 214559605389429001486557] |