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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 96 |
| 3 | 5400 |
| 4 | 188160 |
| 5 | 6615000 |
| 6 | 210760704 |
| 7 | 6565110552 |
| 8 | 197880883200 |
| 9 | 5859173445840 |
| 10 | 170673897680000 |
| 11 | 4912438527364368 |
| 12 | 139967228091285504 |
| 13 | 3955257204911740000 |
| 14 | 110989637900511552000 |
| 15 | 3096031244768383500000 |
[0,2,96,5400,188160,6615000,210760704,6565110552, 197880883200,5859173445840,170673897680000, 4912438527364368,139967228091285504, 3955257204911740000,110989637900511552000, 3096031244768383500000] |