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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 180 |
| 3 | 3240 |
| 4 | 58320 |
| 5 | 1049760 |
| 6 | 18895680 |
| 7 | 340122240 |
| 8 | 6122200320 |
| 9 | 110199605760 |
| 10 | 1983592903680 |
| 11 | 35704672266240 |
| 12 | 642684100792320 |
| 13 | 11568313814261760 |
| 14 | 208229648656711680 |
| 15 | 3748133675820810240 |
[1,10,180,3240,58320,1049760,18895680,340122240, 6122200320,110199605760,1983592903680, 35704672266240,642684100792320,11568313814261760, 208229648656711680,3748133675820810240] |