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A259879 as a simple table

na(n)
01
11
2-1
31
4-3
52
61
7-6
817
9-18
101
11-10
1259
13-170
14168
151
16-15
17145
18-765
191954
20-1920
211
22-21
23295
24-2415
2511224
26-27084
2725920
281
29-28
30532
31-6160
3244359
33-190372
34438948
35-418320

[1,1,-1,1,-3,2,1,-6,17,-18,1,-10,59,-170,168,1,
 -15,145,-765,1954,-1920,1,-21,295,-2415,11224,
 -27084,25920,1,-28,532,-6160,44359,-190372,438948,
 -418320]