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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 26 |
| 6 | 1858 |
| 7 | 236856 |
| 8 | 53448752 |
| 9 | 21492710960 |
| 10 | 15580155490586 |
| 11 | 20666523608722248 |
| 12 | 50987290998908713436 |
| 13 | 237747545131143536698656 |
| 14 | 2125708373867783657045636502 |
| 15 | 36886187089139407854559886683336 |
[1,26,1858,236856,53448752,21492710960, 15580155490586,20666523608722248, 50987290998908713436,237747545131143536698656, 2125708373867783657045636502, 36886187089139407854559886683336] |