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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | -1 |
| 4 | 2 |
| 5 | -1 |
| 6 | 3 |
| 7 | -5 |
| 8 | 12 |
| 9 | 1 |
| 10 | -10 |
| 11 | 20 |
| 12 | 13 |
| 13 | -105 |
| 14 | 180 |
| 15 | 139 |
| 16 | -840 |
| 17 | 1260 |
| 18 | -7 |
| 19 | 174 |
| 20 | -840 |
| 21 | 1120 |
| 22 | -119 |
| 23 | 1881 |
| 24 | -7560 |
| 25 | 9072 |
| 26 | -2167 |
| 27 | 24156 |
| 28 | -83160 |
| 29 | 90720 |
| 30 | 147 |
| 31 | -7150 |
| 32 | 61380 |
| 33 | -184800 |
| 34 | 184800 |
| 35 | 65107 |
| 36 | -1739595 |
| 37 | 12123540 |
| 38 | -32432400 |
| 39 | 29937600 |
| 40 | 1797097 |
| 41 | -32192160 |
| 42 | 188648460 |
[1,-1,2,-1,3,-5,12,1,-10,20,13,-105,180,139,-840, 1260,-7,174,-840,1120,-119,1881,-7560,9072,-2167, 24156,-83160,90720,147,-7150,61380,-184800,184800, 65107,-1739595,12123540,-32432400,29937600, 1797097,-32192160,188648460] |