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A009332 as a simple table

na(n)
00
11
2-1
3-2
44
50
6-1
7-16
864
9-256
101319
11-7680
1249204
13-346112
142653559
15-22022144
16196707424
17-1881735168
1819194804719
19-207983607808
202385684870724
21-28880901505024
22367985503366799
23-4922617151619072
2468980888889771104

[0,1,-1,-2,4,0,-1,-16,64,-256,1319,-7680,49204,
 -346112,2653559,-22022144,196707424,-1881735168,
 19194804719,-207983607808,2385684870724,
 -28880901505024,367985503366799,-4922617151619072,
 68980888889771104]