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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 37 |
| 3 | 433 |
| 4 | 1261 |
| 5 | 14701 |
| 6 | 42841 |
| 7 | 499393 |
| 8 | 1455337 |
| 9 | 16964653 |
| 10 | 49438621 |
| 11 | 576298801 |
| 12 | 1679457781 |
| 13 | 19577194573 |
| 14 | 57052125937 |
| 15 | 665048316673 |
| 16 | 1938092824081 |
| 17 | 22592065572301 |
| 18 | 65838103892821 |
| 19 | 767465181141553 |
| 20 | 2236557439531837 |
| 21 | 26071224093240493 |
[13,37,433,1261,14701,42841,499393,1455337, 16964653,49438621,576298801,1679457781, 19577194573,57052125937,665048316673, 1938092824081,22592065572301,65838103892821, 767465181141553,2236557439531837, 26071224093240493] |