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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 13 |
| 6 | 37 |
| 7 | 73 |
| 8 | 378 |
| 9 | 3421 |
| 10 | 36342 |
| 11 | 293256 |
| 12 | 3406317 |
| 13 | 59935388 |
| 14 | 1419179921 |
| 15 | 37034743264 |
| 16 | 1162832741191 |
| 17 | 48524067272860 |
[1,13,37,73,378,3421,36342,293256,3406317, 59935388,1419179921,37034743264,1162832741191, 48524067272860] |