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| n | a(n) |
|---|---|
| 3 | 6 |
| 4 | 104 |
| 5 | 1345 |
| 6 | 16344 |
| 7 | 200452 |
| 8 | 2552192 |
| 9 | 34138908 |
| 10 | 482076000 |
| 11 | 7196676696 |
| 12 | 113548220928 |
| 13 | 1891322394624 |
| 14 | 33205209053184 |
| 15 | 613390541616000 |
| 16 | 11900521690398720 |
| 17 | 242050276080034560 |
| 18 | 5152173699467335680 |
| 19 | 114574144611434273280 |
[6,104,1345,16344,200452,2552192,34138908, 482076000,7196676696,113548220928,1891322394624, 33205209053184,613390541616000,11900521690398720, 242050276080034560,5152173699467335680, 114574144611434273280] |