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A163982 as a simple table

na(n)
0-2
1-1
21
32
4-5
5-16
661
7272
8-1385
9-7936
1050521
11353792
12-2702765
13-22368256
14199360981
151903757312
16-19391512145
17-209865342976
182404879675441
1929088885112832
20-370371188237525
21-4951498053124096
2269348874393137901

[-2,-1,1,2,-5,-16,61,272,-1385,-7936,50521,353792,
 -2702765,-22368256,199360981,1903757312,
 -19391512145,-209865342976,2404879675441,
 29088885112832,-370371188237525,-4951498053124096,
 69348874393137901]