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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 19 |
| 3 | 73 |
| 4 | 433 |
| 5 | 3457 |
| 6 | 72577 |
| 7 | 1669249 |
| 8 | 43400449 |
| 9 | 1302013441 |
| 10 | 46872483841 |
| 11 | 1734281902081 |
| 12 | 67636994181121 |
| 13 | 2840753755607041 |
| 14 | 153400702802780161 |
| 15 | 8743840059758469121 |
| 16 | 638300324362368245761 |
| 17 | 52978926922076564398081 |
[7,19,73,433,3457,72577,1669249,43400449, 1302013441,46872483841,1734281902081, 67636994181121,2840753755607041, 153400702802780161,8743840059758469121, 638300324362368245761,52978926922076564398081] |