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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 36 |
| 4 | 400 |
| 5 | 5400 |
| 6 | 86436 |
| 7 | 1605632 |
| 8 | 34012224 |
| 9 | 810000000 |
| 10 | 21435888100 |
| 11 | 624333422592 |
| 12 | 19851622826256 |
| 13 | 684376513673216 |
| 14 | 25430282226562500 |
| 15 | 1013309916158361600 |
| 16 | 43104723599206637824 |
| 17 | 1949779138161985486848 |
[0,0,0,36,400,5400,86436,1605632,34012224, 810000000,21435888100,624333422592,19851622826256, 684376513673216,25430282226562500, 1013309916158361600,43104723599206637824, 1949779138161985486848] |