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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 43 |
| 4 | 371 |
| 5 | 3431 |
| 6 | 34153 |
| 7 | 353333 |
| 8 | 3770475 |
| 9 | 41165305 |
| 10 | 457714497 |
| 11 | 5164908167 |
| 12 | 58997692301 |
| 13 | 680874861687 |
| 14 | 7926902673655 |
| 15 | 92986983743513 |
| 16 | 1097999648804923 |
| 17 | 13040634990748733 |
| 18 | 155677447454317639 |
| 19 | 1866995100779692627 |
| 20 | 22482675584863229261 |
[1,7,43,371,3431,34153,353333,3770475,41165305, 457714497,5164908167,58997692301,680874861687, 7926902673655,92986983743513,1097999648804923, 13040634990748733,155677447454317639, 1866995100779692627,22482675584863229261] |