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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 1200 |
| 3 | 1596000 |
| 4 | 23365440000 |
| 5 | 3763004112000000 |
| 6 | 6666387564654720000000 |
| 7 | 129909027758312519942400000000 |
| 8 | 27847153692160782464830528512000000000 |
| 9 | 65662131721505488121539650946349537280000000000 |
[1,10,1200,1596000,23365440000,3763004112000000, 6666387564654720000000, 129909027758312519942400000000, 27847153692160782464830528512000000000, 65662131721505488121539650946349537280000000000] |