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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 749 |
| 3 | 3937 |
| 4 | 43308 |
| 5 | 2250982 |
| 6 | 11512566 |
| 7 | 3558888 |
| 8 | 473983329 |
| 9 | 4102010820 |
| 10 | 3773723044 |
| 11 | 16952125989 |
| 12 | 322374164226 |
| 13 | 702125798925 |
| 14 | 118364239437 |
| 15 | 7609460886830 |
| 16 | 38642046123073 |
| 17 | 22788500587323 |
| 18 | 61246570410530 |
[21,749,3937,43308,2250982,11512566,3558888, 473983329,4102010820,3773723044,16952125989, 322374164226,702125798925,118364239437, 7609460886830,38642046123073,22788500587323, 61246570410530] |