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A259876 as a simple table

na(n)
01
11
2-1
33
4-3
51
621
7-21
87
9-1
10315
11-315
12105
13-15
141
159765
16-9765
173255
18-465
1931
20-1
21615195
22-615195
23205065
24-29295
251953
26-63
271
2878129765
29-78129765
3026043255
31-3720465
32248031
33-8001
34127
35-1
3619923090075
37-19923090075
386641030025
39-948718575
4063247905
41-2040255
4232385
43-255
441

[1,1,-1,3,-3,1,21,-21,7,-1,315,-315,105,-15,1,
 9765,-9765,3255,-465,31,-1,615195,-615195,205065,
 -29295,1953,-63,1,78129765,-78129765,26043255,
 -3720465,248031,-8001,127,-1,19923090075,
 -19923090075,6641030025,-948718575,63247905,
 -2040255,32385,-255,1]