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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 210 |
| 3 | 6720 |
| 4 | 288960 |
| 5 | 15603840 |
| 6 | 1014249600 |
| 7 | 77082969600 |
| 8 | 6706218355200 |
| 9 | 657209398809600 |
| 10 | 71635824470246400 |
| 11 | 8596298936429568000 |
| 12 | 1126115160672273408000 |
| 13 | 159908352815462823936000 |
| 14 | 24465977980765812062208000 |
| 15 | 4012420388845593178202112000 |
[1,10,210,6720,288960,15603840,1014249600, 77082969600,6706218355200,657209398809600, 71635824470246400,8596298936429568000, 1126115160672273408000,159908352815462823936000, 24465977980765812062208000, 4012420388845593178202112000] |