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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 288 |
| 4 | 4608 |
| 5 | 92160 |
| 6 | 2211840 |
| 7 | 61931520 |
| 8 | 1981808640 |
| 9 | 71345111040 |
| 10 | 2853804441600 |
| 11 | 125567395430400 |
| 12 | 6027234980659200 |
| 13 | 313416218994278400 |
| 14 | 17551308263679590400 |
| 15 | 1053078495820775424000 |
| 16 | 67397023732529627136000 |
[1,3,24,288,4608,92160,2211840,61931520, 1981808640,71345111040,2853804441600, 125567395430400,6027234980659200, 313416218994278400,17551308263679590400, 1053078495820775424000,67397023732529627136000] |