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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 360 |
| 4 | 8064 |
| 5 | 259200 |
| 6 | 11404800 |
| 7 | 660441600 |
| 8 | 48771072000 |
| 9 | 4477184409600 |
| 10 | 500391198720000 |
| 11 | 66920738734080000 |
| 12 | 10554356508917760000 |
| 13 | 1938789402181632000000 |
| 14 | 410402940653807861760000 |
| 15 | 99180710658003566592000000 |
| 16 | 27141314475238493257728000000 |
[1,2,24,360,8064,259200,11404800,660441600, 48771072000,4477184409600,500391198720000, 66920738734080000,10554356508917760000, 1938789402181632000000,410402940653807861760000, 99180710658003566592000000, 27141314475238493257728000000] |