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A131758 as a simple table

na(n)
01
10
21
3-1
41
52
64
7-14
810
96
10-15
1183
12-157
1389
1424
1556
16-424
171266
18-1724
19826
20120
21-185
221887
23-8038
2417642
25-19593
268287
27720
28204
29-4976
3036226
31-126944
32239576
33-234688
3490602
355040

[1,0,1,-1,1,2,4,-14,10,6,-15,83,-157,89,24,56,
 -424,1266,-1724,826,120,-185,1887,-8038,17642,
 -19593,8287,720,204,-4976,36226,-126944,239576,
 -234688,90602,5040]