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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 55 |
| 3 | 868 |
| 4 | 12159 |
| 5 | 175471 |
| 6 | 2519488 |
| 7 | 36221263 |
| 8 | 520615791 |
| 9 | 7483320292 |
| 10 | 107564015719 |
| 11 | 1546111034695 |
| 12 | 22223587182336 |
| 13 | 319438814614615 |
| 14 | 4591569914960743 |
| 15 | 65998599449004004 |
| 16 | 948654862324898319 |
[7,55,868,12159,175471,2519488,36221263,520615791, 7483320292,107564015719,1546111034695, 22223587182336,319438814614615,4591569914960743, 65998599449004004,948654862324898319] |