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A124841 as a simple table

na(n)
01
1-1
22
3-3
43
50
6-10
735
8-90
9200
10-400
11726
12-1188
131716
14-2080
151820
16-312
17-2704
185408
19455
20-39195
21170313
22-523029
231352078
24-3114774
256548074
26-12668578
2722492886
28-36020998
2949549110
30-49549110
310
32182029056
33-670853984
341809734560
35-4242470755

[1,-1,2,-3,3,0,-10,35,-90,200,-400,726,-1188,1716,
 -2080,1820,-312,-2704,5408,455,-39195,170313,
 -523029,1352078,-3114774,6548074,-12668578,
 22492886,-36020998,49549110,-49549110,0,182029056,
 -670853984,1809734560,-4242470755]