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A249580 as a simple table

na(n)
13
2-1
3-2
41
5-9
64
77
8-3
930
10-13
11-23
1210
13-99
1443
1576
16-33
17327
18-142
19-251
20109
21-1080
22469
23829
24-360
253567
26-1549
27-2738
281189
29-11781
305116
319043
32-3927
3338910
34-16897
35-29867
3612970
37-128511
3855807
3998644
40-42837

[3,-1,-2,1,-9,4,7,-3,30,-13,-23,10,-99,43,76,-33,
 327,-142,-251,109,-1080,469,829,-360,3567,-1549,
 -2738,1189,-11781,5116,9043,-3927,38910,-16897,
 -29867,12970,-128511,55807,98644,-42837]