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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 50 |
| 4 | 17794 |
| 5 | 174685429024800 |
| 6 | 1476099903835055889100 |
| 7 | 569361345959217303084880851701375547158 |
| 8 | 24894339520238610434672964029323166045198384692144 |
| 9 | 221903632506534809770887023612289701531002339299063461384464526904412590996 |
[1,5,50,17794,174685429024800, 1476099903835055889100, 569361345959217303084880851701375547158, 24894339520238610434672964029323166045198384692144\ , 22190363250653480977088702361228970153100233929906\ 3461384464526904412590996] |