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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 18226 |
| 4 | 4041974015 |
| 5 | 285912852294921876 |
| 6 | 10046278068363977051128904352 |
| 7 | 252848108054080530934326716965286554552380 |
| 8 | 6218295117529777826597449794390561827118547543121719263231 |
[1,15,18226,4041974015,285912852294921876, 10046278068363977051128904352, 252848108054080530934326716965286554552380, 62182951175297778265974497943905618271185475431217\ 19263231] |