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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | -9 |
| 3 | 236 |
| 4 | 981 |
| 5 | -47524 |
| 6 | -295029 |
| 7 | 20208716 |
| 8 | 167213961 |
| 9 | -14741279044 |
| 10 | -152462570049 |
| 11 | 16429489441196 |
| 12 | 203906790454941 |
| 13 | -25968596099278564 |
| 14 | -376012858170009069 |
| 15 | 55254540434093713676 |
| 16 | 914353480122881739921 |
| 17 | -152277985980992039230084 |
| 18 | -2834887281233334168196089 |
[1,-4,-9,236,981,-47524,-295029,20208716, 167213961,-14741279044,-152462570049, 16429489441196,203906790454941,-25968596099278564, -376012858170009069,55254540434093713676, 914353480122881739921,-152277985980992039230084, -2834887281233334168196089] |