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| n | a(n) |
|---|---|
| 3 | 13 |
| 4 | 505 |
| 5 | 3991681 |
| 6 | 622702081 |
| 7 | 35568742809601 |
| 8 | 12164510040883201 |
| 9 | 2585201673888497664001 |
| 10 | 884176199373970195454361600001 |
| 11 | 822283865417792281772556288000001 |
[13,505,3991681,622702081,35568742809601, 12164510040883201,2585201673888497664001, 884176199373970195454361600001, 822283865417792281772556288000001] |