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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | -4 |
| 4 | -106 |
| 5 | -6948 |
| 6 | -1623788 |
| 7 | -1213437064 |
| 8 | -2912047916698 |
| 9 | -23264250235542100 |
| 10 | -641982248042094828676 |
| 11 | -62929856484660987275500088 |
| 12 | -22331407793040258023249030997892 |
| 13 | -29057717949243934527799656871001480808 |
[1,2,2,-4,-106,-6948,-1623788,-1213437064, -2912047916698,-23264250235542100, -641982248042094828676, -62929856484660987275500088, -22331407793040258023249030997892, -29057717949243934527799656871001480808] |