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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 283 |
| 3 | 3129 |
| 4 | 31003 |
| 5 | 287217 |
| 6 | 2547091 |
| 7 | 21931833 |
| 8 | 185027755 |
| 9 | 1538650113 |
| 10 | 12663786499 |
| 11 | 103454051337 |
| 12 | 840560481307 |
| 13 | 6802315926609 |
| 14 | 54886579262707 |
| 15 | 441905197121241 |
| 16 | 3552134005816459 |
| 17 | 28518494951667105 |
[1,21,283,3129,31003,287217,2547091,21931833, 185027755,1538650113,12663786499,103454051337, 840560481307,6802315926609,54886579262707, 441905197121241,3552134005816459, 28518494951667105] |