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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 7 |
| 5 | 48672 |
| 6 | 124400 |
| 7 | 1774217134800 |
| 8 | 1029491058898575 |
| 9 | 62556720388661606307200 |
| 10 | 2061682836097056836507926992 |
| 11 | 386206661135076679862809432480129252579200 |
| 12 | 173506806307870079897445276652899084000 |
| 13 | 36715574957259081430156379774655003162841821725394367760220600000 |
[1,1,8,7,48672,124400,1774217134800, 1029491058898575,62556720388661606307200, 2061682836097056836507926992, 386206661135076679862809432480129252579200, 173506806307870079897445276652899084000, 36715574957259081430156379774655003162841821725394\ 367760220600000] |