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| n | a(n) |
|---|---|
| 1 | 52 |
| 2 | 1750 |
| 3 | 35775 |
| 4 | 507549 |
| 5 | 5442547 |
| 6 | 46757209 |
| 7 | 335279744 |
| 8 | 2067951459 |
| 9 | 11224133015 |
| 10 | 54571222450 |
| 11 | 241058398756 |
| 12 | 978630346891 |
| 13 | 3686088206746 |
| 14 | 12983700750813 |
| 15 | 43054563334197 |
| 16 | 135177521790982 |
| 17 | 403818954811225 |
| 18 | 1152699706324158 |
[52,1750,35775,507549,5442547,46757209,335279744, 2067951459,11224133015,54571222450,241058398756, 978630346891,3686088206746,12983700750813, 43054563334197,135177521790982,403818954811225, 1152699706324158] |