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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 132 |
| 7 | 6178 |
| 8 | 594203 |
| 9 | 85820809 |
| 10 | 16341829155 |
| 11 | 3875736708590 |
| 12 | 1112175913348040 |
| 13 | 378860991866916370 |
| 14 | 151006214911844288232 |
| 15 | 69600017255860985666964 |
| 16 | 36729204987785981237238642 |
| 17 | 22003003913198378660826731007 |
| 18 | 14851323097928973689736994569534 |
[1,7,132,6178,594203,85820809,16341829155, 3875736708590,1112175913348040,378860991866916370, 151006214911844288232,69600017255860985666964, 36729204987785981237238642, 22003003913198378660826731007, 14851323097928973689736994569534] |