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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 233 |
| 3 | 4181 |
| 4 | 75025 |
| 5 | 1346269 |
| 6 | 24157817 |
| 7 | 433494437 |
| 8 | 7778742049 |
| 9 | 139583862445 |
| 10 | 2504730781961 |
| 11 | 44945570212853 |
| 12 | 806515533049393 |
| 13 | 14472334024676221 |
| 14 | 259695496911122585 |
| 15 | 4660046610375530309 |
| 16 | 83621143489848422977 |
| 17 | 1500520536206896083277 |
| 18 | 26925748508234281076009 |
[1,13,233,4181,75025,1346269,24157817,433494437, 7778742049,139583862445,2504730781961, 44945570212853,806515533049393,14472334024676221, 259695496911122585,4660046610375530309, 83621143489848422977,1500520536206896083277, 26925748508234281076009] |