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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 558 |
| 3 | 7471 |
| 4 | 82119 |
| 5 | 780301 |
| 6 | 6615617 |
| 7 | 51115125 |
| 8 | 365372944 |
| 9 | 2443413428 |
| 10 | 15419852290 |
| 11 | 92459940444 |
| 12 | 529685434303 |
| 13 | 2912402216693 |
| 14 | 15427940560977 |
| 15 | 78993195741608 |
| 16 | 392010552915543 |
| 17 | 1890042591320457 |
[1,31,558,7471,82119,780301,6615617,51115125, 365372944,2443413428,15419852290,92459940444, 529685434303,2912402216693,15427940560977, 78993195741608,392010552915543,1890042591320457] |