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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 81 |
| 5 | 1335 |
| 6 | 49309 |
| 7 | 3882180 |
| 8 | 633703214 |
| 9 | 212061201327 |
| 10 | 144669917959584 |
| 11 | 200541263416077021 |
| 12 | 563631413420071614333 |
| 13 | 3206926569346230863485855 |
| 14 | 36897315109526505791310840932 |
| 15 | 857701705296285206387609947414980 |
| 16 | 40254707002970300021370965171570478599 |
[1,1,3,12,81,1335,49309,3882180,633703214, 212061201327,144669917959584,200541263416077021, 563631413420071614333,3206926569346230863485855, 36897315109526505791310840932, 857701705296285206387609947414980, 40254707002970300021370965171570478599] |