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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 61 |
| 5 | 421 |
| 6 | 3361 |
| 7 | 30241 |
| 8 | 332641 |
| 9 | 3991681 |
| 10 | 55883521 |
| 11 | 950019841 |
| 12 | 19000396801 |
| 13 | 456009523201 |
| 14 | 13680285696001 |
| 15 | 465129713664001 |
| 16 | 20465707401216001 |
| 17 | 1473530932887552001 |
| 18 | 125250129295441920001 |
| 19 | 10771511119408005120001 |
[3,5,13,61,421,3361,30241,332641,3991681,55883521, 950019841,19000396801,456009523201,13680285696001, 465129713664001,20465707401216001, 1473530932887552001,125250129295441920001, 10771511119408005120001] |