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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | -322 |
| 3 | -35320 |
| 4 | -8948 |
| 5 | 101825200 |
| 6 | 2068806280 |
| 7 | -399730640800 |
| 8 | -18450359755120 |
| 9 | 1939836986158400 |
| 10 | 158687177411937760 |
| 11 | -10831879491824892800 |
| 12 | -1476931152842107545920 |
| 13 | 64308780860328720300800 |
| 14 | 15148651417782595832021120 |
| 15 | -347060128580550788160064000 |
[1,20,-322,-35320,-8948,101825200,2068806280, -399730640800,-18450359755120,1939836986158400, 158687177411937760,-10831879491824892800, -1476931152842107545920,64308780860328720300800, 15148651417782595832021120, -347060128580550788160064000] |