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A118210 as a simple table

na(n)
12
21
31
4-1
51
6-3
723
8-53
923
10-79
11457
12-89
131213
14-463
1589
163667
17-457
181181
19-95059
2027967
21-123601
2293209
23-10741
2429
25-392351
261560269
2773789
28-1224791
2936000427
30-339667
31280099
32-64339153
3322544987
34-1599245737
3542785159
36-133486139
375539281131

[2,1,1,-1,1,-3,23,-53,23,-79,457,-89,1213,-463,89,
 3667,-457,1181,-95059,27967,-123601,93209,-10741,
 29,-392351,1560269,73789,-1224791,36000427,
 -339667,280099,-64339153,22544987,-1599245737,
 42785159,-133486139,5539281131]