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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 73 |
| 6 | 31998 |
| 7 | 0 |
| 8 | 3960 |
| 9 | 10414981 |
| 10 | 20334816290 |
| 11 | 0 |
| 12 | 190475 |
[0,0,1,0,73,31998,0,3960,10414981,20334816290,0, 190475] |