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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 139 |
| 5 | 829 |
| 6 | 3331 |
| 7 | 32941 |
| 8 | 176417 |
| 9 | 854929 |
| 10 | 2233531 |
| 11 | 12699571 |
| 12 | 47924959 |
| 13 | 763597201 |
| 14 | 5775760189 |
[2,3,7,19,139,829,3331,32941,176417,854929, 2233531,12699571,47924959,763597201,5775760189] |