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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 450 |
| 3 | 119280 |
| 4 | 78863400 |
| 5 | 109520755344 |
| 6 | 286266696940224 |
| 7 | 1296790704270547200 |
| 8 | 9516008352506751089280 |
| 9 | 106865158822383325849056000 |
| 10 | 1750834760922461163750744303360 |
| 11 | 40208636074137918720878142328872960 |
| 12 | 1251936919292954052906797742408328704000 |
[1,6,450,119280,78863400,109520755344, 286266696940224,1296790704270547200, 9516008352506751089280, 106865158822383325849056000, 1750834760922461163750744303360, 40208636074137918720878142328872960, 1251936919292954052906797742408328704000] |