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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 2944 |
| 4 | 391635 |
| 5 | 17392128 |
| 6 | 385866060 |
| 7 | 5303086848 |
| 8 | 51332824275 |
| 9 | 380176030720 |
| 10 | 2279635315794 |
| 11 | 11522261136000 |
| 12 | 50576242992268 |
| 13 | 197196432781824 |
| 14 | 695091512105880 |
| 15 | 2246019242126592 |
| 16 | 6728295917456595 |
| 17 | 18857917384178688 |
| 18 | 49830812542200039 |
[0,3,2944,391635,17392128,385866060,5303086848, 51332824275,380176030720,2279635315794, 11522261136000,50576242992268,197196432781824, 695091512105880,2246019242126592,6728295917456595, 18857917384178688,49830812542200039] |