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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 211 |
| 5 | 1321 |
| 6 | 7561 |
| 7 | 120121 |
| 8 | 1580041 |
| 9 | 24864841 |
| 10 | 328648321 |
| 11 | 7558911361 |
| 12 | 162023621761 |
| 13 | 5022732274561 |
| 14 | 93163582512001 |
| 15 | 4083134943888001 |
| 16 | 151075992923856001 |
| 17 | 5236072827921936001 |
| 18 | 188391763176048432001 |
| 19 | 8854412869274276304001 |
| 20 | 469283882071536644112001 |
| 21 | 29844457947060064452144001 |
| 22 | 1917963226026370264485744001 |
[3,7,31,211,1321,7561,120121,1580041,24864841, 328648321,7558911361,162023621761,5022732274561, 93163582512001,4083134943888001, 151075992923856001,5236072827921936001, 188391763176048432001,8854412869274276304001, 469283882071536644112001, 29844457947060064452144001, 1917963226026370264485744001] |