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| n | a(n) |
|---|---|
| 1 | 56 |
| 2 | 672 |
| 3 | 14112 |
| 4 | 522144 |
| 5 | 33939360 |
| 6 | 3869087040 |
| 7 | 773817408000 |
| 8 | 271609910208000 |
| 9 | 167311704688128000 |
| 10 | 180863952767866368000 |
| 11 | 343098918400642500096000 |
| 12 | 1142176299355738882819584000 |
| 13 | 6672593940836226553432009728000 |
[56,672,14112,522144,33939360,3869087040, 773817408000,271609910208000,167311704688128000, 180863952767866368000,343098918400642500096000, 1142176299355738882819584000, 6672593940836226553432009728000] |