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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 60 |
| 4 | 12600 |
| 5 | 37837800 |
| 6 | 2053230379200 |
| 7 | 2431106898187968000 |
| 8 | 73566121315513295589120000 |
| 9 | 65191584694745586153436251091200000 |
| 10 | 1906765806522767212441719098019963758016000000 |
| 11 | 2048024348726152339387799085049745725891853852479488000000 |
[1,1,3,60,12600,37837800,2053230379200, 2431106898187968000,73566121315513295589120000, 65191584694745586153436251091200000, 1906765806522767212441719098019963758016000000, 20480243487261523393877990850497457258918538524794\ 88000000] |