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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 17 |
| 6 | 207 |
| 7 | 2278 |
| 8 | 24527 |
| 9 | 268104 |
| 10 | 3036850 |
| 11 | 36092688 |
| 12 | 453570148 |
| 13 | 6053567742 |
| 14 | 85968651558 |
| 15 | 1299069917989 |
[1,17,207,2278,24527,268104,3036850,36092688, 453570148,6053567742,85968651558,1299069917989] |