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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 355 |
| 4 | 126660 |
| 5 | 160936020 |
| 6 | 596500235301 |
| 7 | 5533046895002949 |
| 8 | 114246189025868653880 |
| 9 | 4791845694620286764862960 |
| 10 | 379477402498522892976988816800 |
| 11 | 53453544889838303139764031973905360 |
[0,5,355,126660,160936020,596500235301, 5533046895002949,114246189025868653880, 4791845694620286764862960, 379477402498522892976988816800, 53453544889838303139764031973905360] |