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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 35 |
| 5 | 14700 |
| 6 | 11832975 |
| 7 | 15245900670 |
| 8 | 29683109280825 |
| 9 | 84114515340655800 |
| 10 | 335974271076054435825 |
| 11 | 1839316574841276904122750 |
| 12 | 13461678841737111645720135075 |
| 13 | 128798406388658994689642297857500 |
[1,0,0,0,35,14700,11832975,15245900670, 29683109280825,84114515340655800, 335974271076054435825,1839316574841276904122750, 13461678841737111645720135075, 128798406388658994689642297857500] |