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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 168 |
| 4 | 59706529 |
| 5 | 393187796609898300 |
| 6 | 640452934762921719920123363204929 |
| 7 | 3953182835679963218417936393286738407349843878606730708 |
| 8 | 1494965251274035901151835612145099097117648125436532015783603339637972099799668843761 |
| 9 | 567739194652609242674354735113784587341360405864312182081785637035318428980909824192875939414508750046490358101678212604744 |
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