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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 168 |
| 4 | 3756 |
| 5 | 261560 |
| 6 | 80733232 |
| 7 | 96730287424 |
| 8 | 412733638204832 |
| 9 | 6222933783425122080 |
| 10 | 334514554099356252794912 |
| 11 | 64846889330532757107162199040 |
| 12 | 45814974387230048629026769270192768 |
[1,2,14,168,3756,261560,80733232,96730287424, 412733638204832,6222933783425122080, 334514554099356252794912, 64846889330532757107162199040, 45814974387230048629026769270192768] |