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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 10 |
| 5 | 83 |
| 6 | 452 |
| 7 | 3171 |
| 8 | 14700 |
| 9 | 97482 |
| 10 | 422544 |
| 11 | 2730615 |
| 12 | 11442786 |
| 13 | 72932904 |
| 14 | 299882916 |
| 15 | 1895949055 |
| 16 | 7706754370 |
| 17 | 48478715240 |
| 18 | 195623710160 |
| 19 | 1226501910315 |
| 20 | 4925351886030 |
| 21 | 30811853728475 |
| 22 | 123326259948044 |
| 23 | 770315837004637 |
| 24 | 3076174085773624 |
| 25 | 19193549752057758 |
| 26 | 76523420240817792 |
[1,10,83,452,3171,14700,97482,422544,2730615, 11442786,72932904,299882916,1895949055,7706754370, 48478715240,195623710160,1226501910315, 4925351886030,30811853728475,123326259948044, 770315837004637,3076174085773624, 19193549752057758,76523420240817792] |