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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 4 |
| 4 | 9 |
| 5 | 25 |
| 6 | 82 |
| 7 | 307 |
| 8 | 1283 |
| 9 | 5894 |
| 10 | 29427 |
| 11 | 158269 |
| 12 | 910520 |
| 13 | 5570737 |
| 14 | 36071631 |
| 15 | 246188196 |
| 16 | 1764757189 |
| 17 | 13246059237 |
| 18 | 103825154098 |
| 19 | 847806545767 |
| 20 | 7196895817375 |
| 21 | 63389642645486 |
| 22 | 578318132627495 |
| 23 | 5456455370760825 |
| 24 | 53165437331978992 |
| 25 | 534262881004973981 |
[3,4,9,25,82,307,1283,5894,29427,158269,910520, 5570737,36071631,246188196,1764757189,13246059237, 103825154098,847806545767,7196895817375, 63389642645486,578318132627495,5456455370760825, 53165437331978992,534262881004973981] |