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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 57477120 |
| 3 | 1323082429842432 |
| 4 | 137813651152462288749440 |
| 5 | 49992325433734834899948931370880 |
[64,57477120,1323082429842432, 137813651152462288749440, 49992325433734834899948931370880] |