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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -12 |
| 3 | 60 |
| 4 | -384 |
| 5 | 2772 |
| 6 | -21504 |
| 7 | 175032 |
| 8 | -1474560 |
| 9 | 12748164 |
| 10 | -112459776 |
| 11 | 1008263880 |
| 12 | -9160359936 |
| 13 | 84151254600 |
| 14 | -780341870592 |
| 15 | 7294711613040 |
| 16 | -68670084612096 |
| 17 | 650409360439140 |
| 18 | -6193772337561600 |
| 19 | 59267126633699880 |
| 20 | -569566264641454080 |
| 21 | 5494909312181603160 |
| 22 | -53198968510406983680 |
| 23 | 516695227418183158800 |
| 24 | -5033085020810678108160 |
[1,6,-12,60,-384,2772,-21504,175032,-1474560, 12748164,-112459776,1008263880,-9160359936, 84151254600,-780341870592,7294711613040, -68670084612096,650409360439140,-6193772337561600, 59267126633699880,-569566264641454080, 5494909312181603160,-53198968510406983680, 516695227418183158800,-5033085020810678108160] |