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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 87 |
| 4 | 157 |
| 5 | 1523 |
| 6 | 3445551 |
| 7 | 26620870 |
| 8 | 30512347 |
| 9 | 72713283 |
| 10 | 344661698 |
| 11 | 1129330411 |
| 12 | 3886591581 |
| 13 | 5085084202 |
| 14 | 11916345303 |
| 15 | 15510679381 |
[2,23,87,157,1523,3445551,26620870,30512347, 72713283,344661698,1129330411,3886591581, 5085084202,11916345303,15510679381] |