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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 70 |
| 3 | 34650 |
| 4 | 63063000 |
| 5 | 305540235000 |
| 6 | 3244063941457921 |
| 7 | 66318107269696031401 |
| 8 | 2379613992603610298990440 |
| 9 | 139801056431706089952638689800 |
| 10 | 12738104011291233355807195325583000 |
| 11 | 1723542569871737348415590682638868511200 |
[1,1,70,34650,63063000,305540235000, 3244063941457921,66318107269696031401, 2379613992603610298990440, 139801056431706089952638689800, 12738104011291233355807195325583000, 1723542569871737348415590682638868511200] |