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| n | a(n) |
|---|---|
| 1 | 6000 |
| 2 | 331776 |
| 3 | 32400000 |
| 4 | 101154816 |
| 5 | 301056000000 |
| 6 | 89904012853248 |
| 7 | 208971104256000 |
| 8 | 12418325780889600 |
| 9 | 4982259375000000000 |
| 10 | 375291866372898816000 |
| 11 | 201550864919150779950956544000 |
| 12 | 438201295386966498858139607040000000 |
| 13 | 21789262703685125511464767107171876864000 |
[6000,331776,32400000,101154816,301056000000, 89904012853248,208971104256000,12418325780889600, 4982259375000000000,375291866372898816000, 201550864919150779950956544000, 438201295386966498858139607040000000, 21789262703685125511464767107171876864000] |