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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -3 |
| 3 | -11 |
| 4 | 57 |
| 5 | 361 |
| 6 | -2763 |
| 7 | -24611 |
| 8 | 250737 |
| 9 | 2873041 |
| 10 | -36581523 |
| 11 | -512343611 |
| 12 | 7828053417 |
| 13 | 129570724921 |
| 14 | -2309644635483 |
| 15 | -44110959165011 |
| 16 | 898621108880097 |
| 17 | 19450718635716001 |
| 18 | -445777636063460643 |
| 19 | -10784052561125704811 |
| 20 | 274613643571568682777 |
[1,1,-3,-11,57,361,-2763,-24611,250737,2873041, -36581523,-512343611,7828053417,129570724921, -2309644635483,-44110959165011,898621108880097, 19450718635716001,-445777636063460643, -10784052561125704811,274613643571568682777] |