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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 33 |
| 3 | 89 |
| 4 | 581 |
| 5 | 2909 |
| 6 | 17885 |
| 7 | 107387 |
| 8 | 636197 |
| 9 | 3664311 |
| 10 | 20397261 |
| 11 | 110088763 |
| 12 | 579849133 |
| 13 | 3000181901 |
| 14 | 15332918889 |
| 15 | 77721061539 |
| 16 | 391879647949 |
| 17 | 1969334263587 |
| 18 | 9876322139993 |
| 19 | 49468980310981 |
| 20 | 247600089386801 |
| 21 | 1238741942676679 |
[5,33,89,581,2909,17885,107387,636197,3664311, 20397261,110088763,579849133,3000181901, 15332918889,77721061539,391879647949, 1969334263587,9876322139993,49468980310981, 247600089386801,1238741942676679] |