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A009435 as a simple table

na(n)
00
11
2-1
3-1
40
529
6-105
7139
8-2072
931737
10-247545
111824151
12-22456104
13313750293
14-3929185169
1551584719523
16-793292190480
1713137192234225
18-221862616530705
193947317975733039
20-75492532592047280
211522475446731094285

[0,1,-1,-1,0,29,-105,139,-2072,31737,-247545,
 1824151,-22456104,313750293,-3929185169,
 51584719523,-793292190480,13137192234225,
 -221862616530705,3947317975733039,
 -75492532592047280,1522475446731094285]