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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | -2 |
| 3 | -10 |
| 4 | -37 |
| 5 | -143 |
| 6 | -478 |
| 7 | -1588 |
| 8 | -4910 |
| 9 | -14748 |
| 10 | -42235 |
| 11 | -116910 |
| 12 | -311478 |
| 13 | -803343 |
| 14 | -2004434 |
| 15 | -4853669 |
| 16 | -11414943 |
| 17 | -26127222 |
| 18 | -58267164 |
| 19 | -126811068 |
| 20 | -269647980 |
| 21 | -560935635 |
| 22 | -1142812869 |
| 23 | -2282784640 |
| 24 | -4475122564 |
[-1,-2,-10,-37,-143,-478,-1588,-4910,-14748, -42235,-116910,-311478,-803343,-2004434,-4853669, -11414943,-26127222,-58267164,-126811068, -269647980,-560935635,-1142812869,-2282784640, -4475122564] |