| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 680085 |
| 3 | 1405509000 |
| 4 | 1550251328625 |
| 5 | 1046619143765400 |
| 6 | 473991729034823125 |
| 7 | 153151413728678046000 |
| 8 | 36909490731397295108625 |
| 9 | 6861064221248350742706000 |
| 10 | 1009876431641919171349467525 |
[1,0,680085,1405509000,1550251328625, 1046619143765400,473991729034823125, 153151413728678046000,36909490731397295108625, 6861064221248350742706000, 1009876431641919171349467525] |