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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 36 |
| 3 | 7560 |
| 4 | 17297280 |
| 5 | 36756720 |
| 6 | 2095133040 |
| 7 | 128501493120 |
| 8 | 321253732800 |
| 9 | 963761198400 |
| 10 | 13492656777600 |
| 11 | 27949074753600 |
| 12 | 55898149507200 |
| 13 | 93163582512000 |
| 14 | 97821761637600 |
| 15 | 1516237305382800 |
| 16 | 673209363589963200 |
| 17 | 278914005382139703576000 |
| 18 | 743770681019039209536000 |
[12,36,7560,17297280,36756720,2095133040, 128501493120,321253732800,963761198400, 13492656777600,27949074753600,55898149507200, 93163582512000,97821761637600,1516237305382800, 673209363589963200,278914005382139703576000, 743770681019039209536000] |