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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 615 |
| 5 | 84910 |
| 6 | 8241540 |
| 7 | 759337545 |
| 8 | 73117894428 |
| 9 | 7578889491370 |
| 10 | 848729993032718 |
| 11 | 102072779621746876 |
| 12 | 13069744040275286234 |
| 13 | 1766655687081261435255 |
| 14 | 250232365919081938956865 |
| 15 | 36910187948533534644694094 |
[0,0,1,615,84910,8241540,759337545,73117894428, 7578889491370,848729993032718,102072779621746876, 13069744040275286234,1766655687081261435255, 250232365919081938956865, 36910187948533534644694094] |