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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 5040 |
| 3 | 6227020800 |
| 4 | 51090942171709440000 |
| 5 | 8222838654177922817725562880000000 |
| 6 | 60415263063373835637355132068513997507264512000000000 |
| 7 | 40526919504877216755680601905432322134980384796226602145184481280000000000000 |
[1,6,5040,6227020800,51090942171709440000, 8222838654177922817725562880000000, 60415263063373835637355132068513997507264512000000\ 000, 40526919504877216755680601905432322134980384796226\ 602145184481280000000000000] |