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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | -14 |
| 3 | -196 |
| 4 | 480 |
| 5 | 696 |
| 6 | -57901 |
| 7 | -525364 |
| 8 | -409579 |
| 9 | 18528507 |
| 10 | -237549252 |
| 11 | -2119519900 |
| 12 | 6713972874 |
| 13 | 18262155072 |
| 14 | -19072020914992 |
| 15 | 162234208372185 |
| 16 | 1471912942112734 |
| 17 | 6828673030820538 |
| 18 | -35126752028893500 |
| 19 | 729026655790306778 |
| 20 | -15365360727898374618 |
[4,-14,-196,480,696,-57901,-525364,-409579, 18528507,-237549252,-2119519900,6713972874, 18262155072,-19072020914992,162234208372185, 1471912942112734,6828673030820538, -35126752028893500,729026655790306778, -15365360727898374618] |