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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 240 |
| 4 | 3840 |
| 5 | 67200 |
| 6 | 1290240 |
| 7 | 27095040 |
| 8 | 619315200 |
| 9 | 15328051200 |
| 10 | 408748032000 |
| 11 | 11690193715200 |
| 12 | 357082280755200 |
| 13 | 11605174124544000 |
| 14 | 399932154445824000 |
| 15 | 14568957054812160000 |
| 16 | 559447950904786944000 |
[0,1,16,240,3840,67200,1290240,27095040,619315200, 15328051200,408748032000,11690193715200, 357082280755200,11605174124544000, 399932154445824000,14568957054812160000, 559447950904786944000] |