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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 7 |
| 4 | 13 |
| 5 | 58 |
| 6 | 58 |
| 7 | 135 |
| 8 | 461 |
| 9 | 819 |
| 10 | 2081 |
| 11 | 13624 |
| 12 | 13834 |
| 13 | 35955 |
| 14 | 95773 |
| 15 | 244647 |
| 16 | 639389 |
| 17 | 1798800 |
| 18 | 4374866 |
| 19 | 11448871 |
| 20 | 30002701 |
| 21 | 78439683 |
| 22 | 205337953 |
| 23 | 541653136 |
| 24 | 1407271538 |
[2,3,7,7,13,58,58,135,461,819,2081,13624,13834, 35955,95773,244647,639389,1798800,4374866, 11448871,30002701,78439683,205337953,541653136, 1407271538] |