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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | -2 |
| 1 | 3 |
| 2 | -2 |
| 3 | 3 |
| 4 | -6 |
| 5 | 10 |
| 6 | -12 |
| 7 | 15 |
| 8 | -22 |
| 9 | 30 |
| 10 | -36 |
| 11 | 44 |
| 12 | -60 |
| 13 | 78 |
| 14 | -96 |
| 15 | 117 |
| 16 | -150 |
| 17 | 190 |
| 18 | -228 |
| 19 | 276 |
| 20 | -340 |
| 21 | 420 |
| 22 | -504 |
| 23 | 603 |
| 24 | -732 |
| 25 | 885 |
| 26 | -1052 |
| 27 | 1245 |
| 28 | -1488 |
| 29 | 1770 |
| 30 | -2088 |
| 31 | 2454 |
| 32 | -2902 |
| 33 | 3420 |
| 34 | -3996 |
| 35 | 4666 |
| 36 | -5460 |
| 37 | 6378 |
| 38 | -7400 |
| 39 | 8583 |
| 40 | -9972 |
| 41 | 11566 |
| 42 | -13344 |
| 43 | 15378 |
| 44 | -17752 |
| 45 | 20448 |
[1,-2,3,-2,3,-6,10,-12,15,-22,30,-36,44,-60,78, -96,117,-150,190,-228,276,-340,420,-504,603,-732, 885,-1052,1245,-1488,1770,-2088,2454,-2902,3420, -3996,4666,-5460,6378,-7400,8583,-9972,11566, -13344,15378,-17752,20448] |