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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 90 |
| 4 | 3017084995 |
| 5 | 2023900513877358900 |
| 6 | 14162844503221350778432935135 |
| 7 | 806909026546240414032388715894620684395 |
| 8 | 300748551220458753215613602117054376767307058363395 |
[0,0,90,3017084995,2023900513877358900, 14162844503221350778432935135, 806909026546240414032388715894620684395, 30074855122045875321561360211705437676730705836339\ 5] |