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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 90 |
| 4 | 5145 |
| 5 | 472500 |
| 6 | 63877275 |
| 7 | 11947285350 |
| 8 | 2955047720625 |
| 9 | 934039255149000 |
| 10 | 367306824871861875 |
| 11 | 175873128591661751250 |
| 12 | 100738594342264429175625 |
| 13 | 68014527663768884135437500 |
[1,0,3,90,5145,472500,63877275,11947285350, 2955047720625,934039255149000,367306824871861875, 175873128591661751250,100738594342264429175625, 68014527663768884135437500] |