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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 249 |
| 3 | 4081 |
| 4 | 65089 |
| 5 | 1040977 |
| 6 | 16654561 |
| 7 | 266461045 |
| 8 | 4263157633 |
| 9 | 68206942353 |
| 10 | 1091253912337 |
| 11 | 17459148261297 |
| 12 | 279331743809857 |
| 13 | 4469073858100989 |
| 14 | 71501437236882745 |
| 15 | 1143963087047946337 |
| 16 | 18302450903099098801 |
[13,249,4081,65089,1040977,16654561,266461045, 4263157633,68206942353,1091253912337, 17459148261297,279331743809857,4469073858100989, 71501437236882745,1143963087047946337, 18302450903099098801] |