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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 81 |
| 4 | 1228 |
| 5 | 28174 |
| 6 | 843186 |
| 7 | 30551755 |
| 8 | 1291861997 |
| 9 | 62352938720 |
| 10 | 3381736322813 |
| 11 | 203604398647922 |
| 12 | 13475238697911184 |
| 13 | 972429507963453210 |
| 14 | 75993857157285258473 |
| 15 | 6393779463050776636807 |
| 16 | 576237114190853665462712 |
[3,11,81,1228,28174,843186,30551755,1291861997, 62352938720,3381736322813,203604398647922, 13475238697911184,972429507963453210, 75993857157285258473,6393779463050776636807, 576237114190853665462712] |