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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 37 |
| 4 | 431 |
| 5 | 14401 |
| 6 | 403199 |
| 7 | 25401601 |
| 8 | 1216454399 |
| 9 | 135339724801 |
| 10 | 9877056537599 |
| 11 | 1593350922240001 |
| 12 | 178056522962841599 |
| 13 | 38775788043632640001 |
| 14 | 5700041141609893478399 |
| 15 | 1757631343928533032960001 |
| 16 | 327562346808114783805439999 |
| 17 | 126513546505547170185216000001 |
[1,3,37,431,14401,403199,25401601,1216454399, 135339724801,9877056537599,1593350922240001, 178056522962841599,38775788043632640001, 5700041141609893478399,1757631343928533032960001, 327562346808114783805439999, 126513546505547170185216000001] |