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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 51 |
| 3 | 58 |
| 4 | 229 |
| 5 | 1591 |
| 6 | 6590 |
| 7 | 29406 |
| 8 | 180787 |
| 9 | 1110885 |
| 10 | 5756268 |
| 11 | 36802761 |
| 12 | 229866739 |
| 13 | 1326398339 |
| 14 | 8345914515 |
| 15 | 51694139615 |
| 16 | 311041797197 |
| 17 | 1933674989684 |
| 18 | 11927131376828 |
| 19 | 72834711581082 |
| 20 | 450206903590675 |
| 21 | 2772873317202237 |
[3,51,58,229,1591,6590,29406,180787,1110885, 5756268,36802761,229866739,1326398339,8345914515, 51694139615,311041797197,1933674989684, 11927131376828,72834711581082,450206903590675, 2772873317202237] |