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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 2 |
| 3 | -2 |
| 4 | 0 |
| 5 | 6 |
| 6 | -4 |
| 7 | -12 |
| 8 | 12 |
| 9 | 24 |
| 10 | -4 |
| 11 | -60 |
| 12 | -60 |
| 13 | 120 |
| 14 | 120 |
| 15 | 24 |
| 16 | -120 |
| 17 | -720 |
| 18 | -240 |
| 19 | 1080 |
| 20 | 720 |
| 21 | 120 |
| 22 | 840 |
| 23 | -2520 |
| 24 | -8400 |
| 25 | 0 |
| 26 | 10080 |
| 27 | 5040 |
| 28 | -960 |
| 29 | 6720 |
| 30 | 20160 |
| 31 | -47040 |
| 32 | -100800 |
| 33 | 20160 |
| 34 | 100800 |
| 35 | 40320 |
| 36 | -12096 |
| 37 | -60480 |
| 38 | 241920 |
| 39 | 423360 |
[1,-1,2,-2,0,6,-4,-12,12,24,-4,-60,-60,120,120,24, -120,-720,-240,1080,720,120,840,-2520,-8400,0, 10080,5040,-960,6720,20160,-47040,-100800,20160, 100800,40320,-12096,-60480,241920,423360] |