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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 34 |
| 5 | 375 |
| 6 | 15200 |
| 7 | 2066401 |
| 8 | 450054919 |
| 9 | 199271253643 |
| 10 | 431399012916702 |
| 11 | 2151987403947457136 |
| 12 | 15451465958263071713102 |
| 13 | 331187643758039140349444047 |
| 14 | 33475597220485400781283541412048 |
[1,1,2,6,34,375,15200,2066401,450054919, 199271253643,431399012916702,2151987403947457136, 15451465958263071713102, 331187643758039140349444047, 33475597220485400781283541412048] |