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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 36 |
| 3 | 1200 |
| 4 | 58800 |
| 5 | 3810240 |
| 6 | 307359360 |
| 7 | 29682132480 |
| 8 | 3339239904000 |
| 9 | 428906814336000 |
| 10 | 61934143990118400 |
| 11 | 9931984545324441600 |
| 12 | 1751339941492209868800 |
| 13 | 336796142594655744000000 |
| 14 | 70149825129001153536000000 |
| 15 | 15732267448930658699673600000 |
[1,2,36,1200,58800,3810240,307359360,29682132480, 3339239904000,428906814336000,61934143990118400, 9931984545324441600,1751339941492209868800, 336796142594655744000000, 70149825129001153536000000, 15732267448930658699673600000] |