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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 3 |
| 6 | 3 |
| 7 | 21 |
| 8 | 21 |
| 9 | 189 |
| 10 | 189 |
| 11 | 2079 |
| 12 | 2079 |
| 13 | 27027 |
| 14 | 27027 |
| 15 | 27027 |
| 16 | 27027 |
| 17 | 459459 |
| 18 | 459459 |
| 19 | 8729721 |
| 20 | 8729721 |
| 21 | 183324141 |
| 22 | 183324141 |
| 23 | 4216455243 |
| 24 | 4216455243 |
| 25 | 4216455243 |
| 26 | 4216455243 |
| 27 | 113844291561 |
| 28 | 113844291561 |
| 29 | 3301484455269 |
| 30 | 3301484455269 |
| 31 | 102346018113339 |
| 32 | 102346018113339 |
| 33 | 3377418597740187 |
[1,1,1,3,3,3,3,21,21,189,189,2079,2079,27027, 27027,27027,27027,459459,459459,8729721,8729721, 183324141,183324141,4216455243,4216455243, 4216455243,4216455243,113844291561,113844291561, 3301484455269,3301484455269,102346018113339, 102346018113339,3377418597740187] |