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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 12 |
| 2 | 720 |
| 3 | 30240 |
| 4 | 1209600 |
| 5 | 6842880 |
| 6 | 1307674368000 |
| 7 | 74724249600 |
| 8 | 1524374691840000 |
| 9 | 5109094217170944000 |
| 10 | 802857662698291200000 |
| 11 | 287777551824322560000 |
| 12 | 1693824136731743669452800000 |
| 13 | 186134520519971831808000000 |
[2,12,720,30240,1209600,6842880,1307674368000, 74724249600,1524374691840000,5109094217170944000, 802857662698291200000,287777551824322560000, 1693824136731743669452800000, 186134520519971831808000000] |