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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 0 |
| 3 | 400 |
| 4 | 2688 |
| 5 | 1631488 |
| 6 | 60938240 |
| 7 | 35243972608 |
| 8 | 3826154307584 |
| 9 | 2477263324839936 |
| 10 | 571708399442198528 |
| 11 | 435722170330996801536 |
| 12 | 177081722613295659089920 |
| 13 | 162107313371111569999527936 |
[0,2,0,400,2688,1631488,60938240,35243972608, 3826154307584,2477263324839936,571708399442198528, 435722170330996801536,177081722613295659089920, 162107313371111569999527936] |