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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 55 |
| 4 | 1624984 |
| 5 | 604695015651 |
| 6 | 1519010563560867720 |
| 7 | 21289875032822659308693914 |
| 8 | 1419681395223483661783817488296832 |
| 9 | 393979033195135438178790605724141071905152 |
[0,0,55,1624984,604695015651,1519010563560867720, 21289875032822659308693914, 1419681395223483661783817488296832, 393979033195135438178790605724141071905152] |