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A165749 as a simple table

na(n)
01
19
2-63
3585
4-5247
547241
6-425151
73826377
8-34437375
9309936393
10-2789427519
1125104847689
12-225943629183
132033492662665
14-18301433963967
15164712905675721
16-1482416151081471
1713341745359733257

[1,9,-63,585,-5247,47241,-425151,3826377,
 -34437375,309936393,-2789427519,25104847689,
 -225943629183,2033492662665,-18301433963967,
 164712905675721,-1482416151081471,
 13341745359733257]