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A203005 as a simple table

na(n)
11
2-1
31
4-6
51
61
7-15
847
9-1
101
11-40
12270
13-488
141
151
16-165
171738
18-5866
195829
20-1
211
22-1074
2315695
24-80060
25156495
26-74674
271
281
29-9039
30181581
31-1360515
324552003
33-5997165
34997295
35-1
361
37-86700
382566036
39-28081556

[1,-1,1,-6,1,1,-15,47,-1,1,-40,270,-488,1,1,-165,
 1738,-5866,5829,-1,1,-1074,15695,-80060,156495,
 -74674,1,1,-9039,181581,-1360515,4552003,-5997165,
 997295,-1,1,-86700,2566036,-28081556]