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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 18 |
| 4 | 96 |
| 5 | 4300 |
| 6 | 81360 |
| 7 | 3604342 |
| 8 | 128389632 |
| 9 | 6704335980 |
| 10 | 346778956800 |
| 11 | 21896347260084 |
| 12 | 1459386186255360 |
| 13 | 110117675704707190 |
| 14 | 8898156449299703040 |
| 15 | 786739773441598071750 |
| 16 | 74406732202318884372480 |
| 17 | 7565016269351818379826372 |
| 18 | 818338704493281924572946432 |
| 19 | 94154670956813022045927404464 |
| 20 | 11458715042302170139584184320000 |
| 21 | 1472412964588453156024745207931636 |
[1,0,18,96,4300,81360,3604342,128389632, 6704335980,346778956800,21896347260084, 1459386186255360,110117675704707190, 8898156449299703040,786739773441598071750, 74406732202318884372480,7565016269351818379826372, 818338704493281924572946432, 94154670956813022045927404464, 11458715042302170139584184320000, 1472412964588453156024745207931636] |