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| n | a(n) |
|---|---|
| 0 | -6 |
| 1 | -66 |
| 2 | 1110 |
| 3 | 18318 |
| 4 | 333750 |
| 5 | 5938446 |
| 6 | 106865274 |
| 7 | 1915425570 |
| 8 | 34385669382 |
| 9 | 616923941070 |
| 10 | 11070947149014 |
| 11 | 198655308975486 |
| 12 | 3564757609030650 |
| 13 | 63966755470710018 |
| 14 | 1147838391054195510 |
| 15 | 20597113658105850126 |
| 16 | 369600280281802257654 |
| 17 | 6632207432249371045230 |
[-6,-66,1110,18318,333750,5938446,106865274, 1915425570,34385669382,616923941070, 11070947149014,198655308975486,3564757609030650, 63966755470710018,1147838391054195510, 20597113658105850126,369600280281802257654, 6632207432249371045230] |