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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 472 |
| 3 | 467133 |
| 4 | 636541920 |
| 5 | 1038934571875 |
| 6 | 1903991899195896 |
| 7 | 3782689379194538057 |
| 8 | 7975744222034262960000 |
| 9 | 17602442780233361771120400 |
| 10 | 40278979798251016073962405000 |
[1,472,467133,636541920,1038934571875, 1903991899195896,3782689379194538057, 7975744222034262960000,17602442780233361771120400, 40278979798251016073962405000] |