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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 25 |
| 4 | 95 |
| 5 | -275 |
| 6 | -14755 |
| 7 | -278795 |
| 8 | -4134145 |
| 9 | -49014215 |
| 10 | -304537195 |
| 11 | 7111142545 |
| 12 | 397535340575 |
| 13 | 12667519999525 |
| 14 | 327297915798125 |
| 15 | 7052174242084525 |
| 16 | 109425656597938175 |
| 17 | -88497453300450575 |
| 18 | -107470322009554282075 |
| 19 | -6297063330456696598775 |
[1,5,25,95,-275,-14755,-278795,-4134145,-49014215, -304537195,7111142545,397535340575,12667519999525, 327297915798125,7052174242084525, 109425656597938175,-88497453300450575, -107470322009554282075,-6297063330456696598775] |