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A203991 as a simple table

na(n)
12
2-1
37
4-10
51
638
7-71
828
9-1
10281
11-610
12357
13-60
141
152634
16-6329
174620
18-1253
19110
20-1
2129919
22-77530
2365613
24-23348
253514
26-182
271
28399342
29-1098271
301036044
31-442349
3290800
33-8442
34280
35-1
366125265

[2,-1,7,-10,1,38,-71,28,-1,281,-610,357,-60,1,
 2634,-6329,4620,-1253,110,-1,29919,-77530,65613,
 -23348,3514,-182,1,399342,-1098271,1036044,
 -442349,90800,-8442,280,-1,6125265]