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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 60 |
| 4 | 5040 |
| 5 | 384384 |
| 6 | 36628200 |
| 7 | 5967561600 |
| 8 | 1220096908800 |
| 9 | 350804594649600 |
| 10 | 97292707463952000 |
| 11 | 42873948150095462400 |
| 12 | 21336925409736330240000 |
| 13 | 11640487097965528951948800 |
| 14 | 7998487694738166709923840000 |
[2,6,60,5040,384384,36628200,5967561600, 1220096908800,350804594649600,97292707463952000, 42873948150095462400,21336925409736330240000, 11640487097965528951948800, 7998487694738166709923840000] |