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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 89 |
| 4 | 5100 |
| 5 | 510288 |
| 6 | 79419060 |
| 7 | 17758540440 |
| 8 | 5397245411040 |
| 9 | 2140495978400640 |
| 10 | 1073686615986821760 |
| 11 | 664582969579045104000 |
| 12 | 497566995304189636425600 |
| 13 | 443212653988584641970547200 |
| 14 | 463237380681508395317004249600 |
| 15 | 561422444732790213860667834854400 |
[1,0,3,89,5100,510288,79419060,17758540440, 5397245411040,2140495978400640, 1073686615986821760,664582969579045104000, 497566995304189636425600, 443212653988584641970547200, 463237380681508395317004249600, 561422444732790213860667834854400] |