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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 51 |
| 4 | 243 |
| 5 | 1188 |
| 6 | 6399 |
| 7 | 33561 |
| 8 | 207468 |
| 9 | 1013769 |
| 10 | 9226629 |
| 11 | 6480972 |
| 12 | 997054353 |
| 13 | -13211542341 |
| 14 | 359483683932 |
| 15 | -8602977403413 |
| 16 | 235389825828531 |
| 17 | -6809489816432796 |
| 18 | 211363316786680047 |
| 19 | -6976456643635495839 |
| 20 | 244258757298601120476 |
| 21 | -9039628059778792352367 |
| 22 | 352612224537284537865477 |
[1,3,12,51,243,1188,6399,33561,207468,1013769, 9226629,6480972,997054353,-13211542341, 359483683932,-8602977403413,235389825828531, -6809489816432796,211363316786680047, -6976456643635495839,244258757298601120476, -9039628059778792352367,352612224537284537865477] |