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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 19 |
| 3 | 513 |
| 4 | 64447 |
| 5 | 33221793 |
| 6 | 68416620319 |
| 7 | 561987558307353 |
| 8 | 18435485678295497887 |
| 9 | 2417353606284586529475393 |
| 10 | 1267565977842177795997995695599 |
| 11 | 2658400215575093543617417352025297273 |
| 12 | 22300601642487504748989853483652483024500687 |
[1,3,19,513,64447,33221793,68416620319, 561987558307353,18435485678295497887, 2417353606284586529475393, 1267565977842177795997995695599, 2658400215575093543617417352025297273, 22300601642487504748989853483652483024500687] |