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A203810 as a simple table

na(n)
11
21
31
4-1
57
6-1
713
8-9
9199
10-53
111937
12-373
1322871
14-2869
154231
16-547
17134845
18-1291
192425919
20489967
21-10595393
22-13913
23232472561
249379691
25-1023947321
265712079
27-2957435363
28-89098463
2977729577773
3093259013
31-2326198533397
32-139786038869
33385098109121

[1,1,1,-1,7,-1,13,-9,199,-53,1937,-373,22871,
 -2869,4231,-547,134845,-1291,2425919,489967,
 -10595393,-13913,232472561,9379691,-1023947321,
 5712079,-2957435363,-89098463,77729577773,
 93259013,-2326198533397,-139786038869,
 385098109121]