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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 511 |
| 3 | 1353 |
| 4 | 20016 |
| 5 | 132039 |
| 6 | 1216538 |
| 7 | 9600648 |
| 8 | 81327718 |
| 9 | 665822482 |
| 10 | 5547964642 |
| 11 | 45869504563 |
| 12 | 380741848431 |
| 13 | 3154908484252 |
| 14 | 26163271819169 |
| 15 | 216899879798735 |
| 16 | 1798367150917047 |
| 17 | 14910277331599425 |
| 18 | 123621215328946695 |
[5,511,1353,20016,132039,1216538,9600648,81327718, 665822482,5547964642,45869504563,380741848431, 3154908484252,26163271819169,216899879798735, 1798367150917047,14910277331599425, 123621215328946695] |