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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 153 |
| 3 | 153 |
| 4 | 1107 |
| 5 | 2755 |
| 6 | 1107 |
| 7 | 8019 |
| 8 | 49235 |
| 9 | 49235 |
| 10 | 8019 |
| 11 | 58077 |
| 12 | 880781 |
| 13 | 2167173 |
| 14 | 880781 |
| 15 | 58077 |
| 16 | 420633 |
| 17 | 15754461 |
| 18 | 95528423 |
| 19 | 95528423 |
| 20 | 15754461 |
| 21 | 420633 |
| 22 | 3046491 |
| 23 | 281803871 |
| 24 | 4210059673 |
| 25 | 10378244309 |
| 26 | 4210059673 |
| 27 | 281803871 |
| 28 | 3046491 |
| 29 | 22064643 |
[21,153,153,1107,2755,1107,8019,49235,49235,8019, 58077,880781,2167173,880781,58077,420633,15754461, 95528423,95528423,15754461,420633,3046491, 281803871,4210059673,10378244309,4210059673, 281803871,3046491,22064643] |