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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 5 |
| 3 | 37 |
| 4 | 577 |
| 5 | 14401 |
| 6 | 518401 |
| 7 | 25401601 |
| 8 | 1625702401 |
| 9 | 131681894401 |
| 10 | 13168189440001 |
| 11 | 1593350922240001 |
| 12 | 229442532802560001 |
| 13 | 38775788043632640001 |
| 14 | 7600054456551997440001 |
| 15 | 1710012252724199424000001 |
| 16 | 437763136697395052544000001 |
[2,2,5,37,577,14401,518401,25401601,1625702401, 131681894401,13168189440001,1593350922240001, 229442532802560001,38775788043632640001, 7600054456551997440001,1710012252724199424000001, 437763136697395052544000001] |