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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 180 |
| 3 | 12960 |
| 4 | 1710720 |
| 5 | 359251200 |
| 6 | 109930867200 |
| 7 | 46170964224000 |
| 8 | 25486372251648000 |
| 9 | 17891433320656896000 |
| 10 | 15565546988971499520000 |
| 11 | 16437217620353903493120000 |
| 12 | 20710894201645918401331200000 |
| 13 | 30693545206839251070772838400000 |
| 14 | 52854284846177190343870827724800000 |
[1,6,180,12960,1710720,359251200,109930867200, 46170964224000,25486372251648000, 17891433320656896000,15565546988971499520000, 16437217620353903493120000, 20710894201645918401331200000, 30693545206839251070772838400000, 52854284846177190343870827724800000] |