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| n | a(n) |
|---|---|
| 1 | 56 |
| 2 | 528 |
| 3 | 6600 |
| 4 | 100980 |
| 5 | 2117870 |
| 6 | 61630794 |
| 7 | 2607217770 |
| 8 | 156166134300 |
| 9 | 13953736838272 |
| 10 | 1844353230617676 |
| 11 | 367051670671034640 |
| 12 | 109228902733245482050 |
| 13 | 48925662805948380686500 |
[56,528,6600,100980,2117870,61630794,2607217770, 156166134300,13953736838272,1844353230617676, 367051670671034640,109228902733245482050, 48925662805948380686500] |