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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 6 |
| 5 | 30 |
| 6 | 120 |
| 7 | 720 |
| 8 | 15120 |
| 9 | 1164240 |
| 10 | 15135120 |
| 11 | 283931716867999200 |
| 12 | 14510088480716327580681600 |
| 13 | 3280681990411073806237542217555200 |
| 14 | 936436634805345771521186435213604447980767985241556128000 |
[1,1,2,6,6,30,120,720,15120,1164240,15135120, 283931716867999200,14510088480716327580681600, 3280681990411073806237542217555200, 93643663480534577152118643521360444798076798524155\ 6128000] |