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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | -6 |
| 2 | 18 |
| 3 | -63 |
| 4 | 234 |
| 5 | -891 |
| 6 | 3429 |
| 7 | -13257 |
| 8 | 51354 |
| 9 | -199098 |
| 10 | 772173 |
| 11 | -2995218 |
| 12 | 11619045 |
| 13 | -45073827 |
| 14 | 174857211 |
| 15 | -678335958 |
| 16 | 2631522330 |
| 17 | -10208681991 |
| 18 | 39603398850 |
| 19 | -153636822171 |
| 20 | 596016389349 |
| 21 | -2312177133105 |
| 22 | 8969825761002 |
[3,-6,18,-63,234,-891,3429,-13257,51354,-199098, 772173,-2995218,11619045,-45073827,174857211, -678335958,2631522330,-10208681991,39603398850, -153636822171,596016389349,-2312177133105, 8969825761002] |