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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 34 |
| 3 | 587 |
| 4 | 12870 |
| 5 | 337877 |
| 6 | 10262004 |
| 7 | 352436961 |
| 8 | 13465074758 |
| 9 | 565280386625 |
| 10 | 25826066397756 |
| 11 | 1274138666796217 |
| 12 | 67446164001827356 |
| 13 | 3810171540686207283 |
| 14 | 228658931521878071080 |
| 15 | 14520123059677034441895 |
| 16 | 972281769469377542763078 |
| 17 | 68443768336740463562683177 |
[1,3,34,587,12870,337877,10262004,352436961, 13465074758,565280386625,25826066397756, 1274138666796217,67446164001827356, 3810171540686207283,228658931521878071080, 14520123059677034441895,972281769469377542763078, 68443768336740463562683177] |