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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 60 |
| 4 | 56 |
| 5 | 15120 |
| 6 | 15840 |
| 7 | 8648640 |
| 8 | 17297280 |
| 9 | 8821612800 |
| 10 | 10158220800 |
| 11 | 14079294028800 |
| 12 | 474467051520 |
| 13 | 32382376266240000 |
| 14 | 582882772792320000 |
| 15 | 101421602465863680000 |
| 16 | 24659370011308032000 |
| 17 | 415017197290314178560000 |
| 18 | 72810034612335820800000 |
| 19 | 2149789081963827444940800000 |
[1,1,2,60,56,15120,15840,8648640,17297280, 8821612800,10158220800,14079294028800, 474467051520,32382376266240000,582882772792320000, 101421602465863680000,24659370011308032000, 415017197290314178560000,72810034612335820800000, 2149789081963827444940800000] |