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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -1 |
| 3 | 6 |
| 4 | -6 |
| 5 | 1 |
| 6 | 24 |
| 7 | -36 |
| 8 | 12 |
| 9 | 0 |
| 10 | 120 |
| 11 | -240 |
| 12 | 120 |
| 13 | 0 |
| 14 | -4 |
| 15 | 720 |
| 16 | -1800 |
| 17 | 1200 |
| 18 | 0 |
| 19 | -120 |
| 20 | 0 |
| 21 | 5040 |
| 22 | -15120 |
| 23 | 12600 |
| 24 | 0 |
| 25 | -2520 |
| 26 | 0 |
| 27 | 120 |
| 28 | 40320 |
| 29 | -141120 |
| 30 | 141120 |
| 31 | 0 |
| 32 | -47040 |
| 33 | 0 |
| 34 | 6720 |
| 35 | 0 |
| 36 | 362880 |
| 37 | -1451520 |
| 38 | 1693440 |
| 39 | 0 |
| 40 | -846720 |
| 41 | 0 |
| 42 | 241920 |
| 43 | 0 |
| 44 | -12096 |
| 45 | 3628800 |
[1,2,-1,6,-6,1,24,-36,12,0,120,-240,120,0,-4,720, -1800,1200,0,-120,0,5040,-15120,12600,0,-2520,0, 120,40320,-141120,141120,0,-47040,0,6720,0,362880, -1451520,1693440,0,-846720,0,241920,0,-12096, 3628800] |