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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 287 |
| 3 | 3694 |
| 4 | 45609 |
| 5 | 553776 |
| 6 | 6677779 |
| 7 | 80295938 |
| 8 | 964364717 |
| 9 | 11576444932 |
| 10 | 138937682871 |
| 11 | 1667353916982 |
| 12 | 20008755624625 |
| 13 | 240107610616088 |
| 14 | 2881304043028763 |
| 15 | 34575712094589226 |
| 16 | 414908863026422133 |
[1,20,287,3694,45609,553776,6677779,80295938, 964364717,11576444932,138937682871,1667353916982, 20008755624625,240107610616088,2881304043028763, 34575712094589226,414908863026422133] |