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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 18 |
| 3 | 648 |
| 4 | 77760 |
| 5 | 41057280 |
| 6 | 82771476480 |
| 7 | 683361309818880 |
| 8 | 22304913152488243200 |
| 9 | 2929259634489976002969600 |
| 10 | 1534275894314621670931405209600 |
| 11 | 3219180858829475639028172057057689600 |
| 12 | 26997853423424927215248106646837737291776000 |
| 13 | 906008220049901275850865613854890318362709065728000 |
[3,18,648,77760,41057280,82771476480, 683361309818880,22304913152488243200, 2929259634489976002969600, 1534275894314621670931405209600, 3219180858829475639028172057057689600, 26997853423424927215248106646837737291776000, 90600822004990127585086561385489031836270906572800\ 0] |