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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | -4 |
| 3 | 2 |
| 4 | 366 |
| 5 | 2732 |
| 6 | 11720 |
| 7 | 37326 |
| 8 | 98042 |
| 9 | 224696 |
| 10 | 465012 |
| 11 | 888890 |
| 12 | 1594406 |
| 13 | 2714532 |
| 14 | 4424576 |
| 15 | 6950342 |
| 16 | 10577010 |
| 17 | 15658736 |
| 18 | 22628972 |
| 19 | 32011506 |
| 20 | 44432222 |
| 21 | 60631580 |
| 22 | 81477816 |
| 23 | 107980862 |
| 24 | 141306986 |
| 25 | 182794152 |
| 26 | 233968100 |
| 27 | 296559146 |
| 28 | 372519702 |
[0,-4,2,366,2732,11720,37326,98042,224696,465012, 888890,1594406,2714532,4424576,6950342,10577010, 15658736,22628972,32011506,44432222,60631580, 81477816,107980862,141306986,182794152,233968100, 296559146,372519702] |