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| n | a(n) |
|---|---|
| 18 | 34459425 |
| 19 | 4583103525 |
| 20 | 353553700500 |
| 21 | 20941727706900 |
| 22 | 1063956789420525 |
| 23 | 49122916648430625 |
| 24 | 2133284602385096160 |
| 25 | 89095866141017736000 |
| 26 | 3632887356673057858375 |
| 27 | 146162134100332940264675 |
| 28 | 5846991791902793693661500 |
| 29 | 233881907399101905866222300 |
[34459425,4583103525,353553700500,20941727706900, 1063956789420525,49122916648430625, 2133284602385096160,89095866141017736000, 3632887356673057858375,146162134100332940264675, 5846991791902793693661500, 233881907399101905866222300] |