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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 99 |
| 4 | 717 |
| 5 | 5964 |
| 6 | 56701 |
| 7 | 611750 |
| 8 | 7432491 |
| 9 | 100838222 |
| 10 | 1514749135 |
| 11 | 24989362186 |
| 12 | 449429188211 |
| 13 | 8754181791029 |
| 14 | 183621843677724 |
| 15 | 4126714250580949 |
| 16 | 98932328702693666 |
| 17 | 2520187379996442269 |
| 18 | 67980528958530199837 |
| 19 | 1935753445850303203221 |
| 20 | 58025998739501873764826 |
[1,3,16,99,717,5964,56701,611750,7432491, 100838222,1514749135,24989362186,449429188211, 8754181791029,183621843677724,4126714250580949, 98932328702693666,2520187379996442269, 67980528958530199837,1935753445850303203221, 58025998739501873764826] |