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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 29 |
| 5 | 131 |
| 6 | 576 |
| 7 | 2505 |
| 8 | 10857 |
| 9 | 47081 |
| 10 | 204724 |
| 11 | 893766 |
| 12 | 3920310 |
| 13 | 17283214 |
| 14 | 76596745 |
| 15 | 341264480 |
| 16 | 1528405584 |
| 17 | 6880122182 |
| 18 | 31123426923 |
| 19 | 141456560459 |
| 20 | 645811464667 |
| 21 | 2960966353657 |
| 22 | 13630215685869 |
| 23 | 62981140857061 |
| 24 | 292049203818249 |
[1,6,29,131,576,2505,10857,47081,204724,893766, 3920310,17283214,76596745,341264480,1528405584, 6880122182,31123426923,141456560459,645811464667, 2960966353657,13630215685869,62981140857061, 292049203818249] |