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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 331776 |
| 5 | 2524286414780230533120 |
| 6 | 18356962141505758798331790171539976807981714702571497465907439808868887035904000000 |
[1,2,24,331776,2524286414780230533120, 18356962141505758798331790171539976807981714702571\ 497465907439808868887035904000000] |