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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 360 |
| 4 | 75600 |
| 5 | 174636000 |
| 6 | 5244319080000 |
| 7 | 2677277333530800000 |
| 8 | 25968760179275365452000000 |
| 9 | 5793445238736255798985527240000000 |
| 10 | 37481813439427687898244906452608585200000000 |
| 11 | 7517370874372838151564668004911177464757864076000000000 |
| 12 | 55784440720968513813368002533861454979548176771615744085560000000000 |
[1,2,12,360,75600,174636000,5244319080000, 2677277333530800000,25968760179275365452000000, 5793445238736255798985527240000000, 37481813439427687898244906452608585200000000, 75173708743728381515646680049111774647578640760000\ 00000, 55784440720968513813368002533861454979548176771615\ 744085560000000000] |