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A005120 as a simple table

na(n)
00
11
2-1
31
4-1
5-1
65
7-8
87
91
10-19
1143
12-55
1327
1464
15-211
16343
17-307
18-85
19911
20-1919
212344
22-989
23-3151
249625
25-15049
2612609
275671
28-42496
2985609
30-100225
3133977
32154007
33-437009
34657901
35-513512
36-335665
371974097
38-3808891
394265379

[0,1,-1,1,-1,-1,5,-8,7,1,-19,43,-55,27,64,-211,
 343,-307,-85,911,-1919,2344,-989,-3151,9625,
 -15049,12609,5671,-42496,85609,-100225,33977,
 154007,-437009,657901,-513512,-335665,1974097,
 -3808891,4265379]