| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -15 |
| 3 | -345 |
| 4 | -11263 |
| 5 | -455025 |
| 6 | -16466703 |
| 7 | 746021367 |
| 8 | 480286325633 |
| 9 | 150637957014303 |
| 10 | 46203820378253425 |
| 11 | 15313454320801213511 |
| 12 | 5643895146092962507905 |
| 13 | 2333857400234709586763695 |
[1,-1,-15,-345,-11263,-455025,-16466703,746021367, 480286325633,150637957014303,46203820378253425, 15313454320801213511,5643895146092962507905, 2333857400234709586763695] |