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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 240 |
| 4 | 9720 |
| 5 | 556400 |
| 6 | 41153220 |
| 7 | 3737360130 |
| 8 | 402876727680 |
| 9 | 50302825722720 |
| 10 | 7141958361129600 |
| 11 | 1136668023900846360 |
| 12 | 200486825731741824000 |
| 13 | 38826473000115470677800 |
| 14 | 8192096172894406564646400 |
| 15 | 1870885111733841408594984000 |
| 16 | 459893703431651653070494156800 |
[1,1,10,240,9720,556400,41153220,3737360130, 402876727680,50302825722720,7141958361129600, 1136668023900846360,200486825731741824000, 38826473000115470677800,8192096172894406564646400, 1870885111733841408594984000, 459893703431651653070494156800] |