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A256168 as a simple table

na(n)
01
1-2
21
3-1
4-9
5-59
6-474
7-4560
8-50364
9-625385
10-8622658
11-130751886
12-2163331779
13-38793751015
14-749691306018
15-15535914341831
16-343749787006758
17-8089725377931547
18-201801866906374263
19-5319643146604299835
20-147774950436327236681

[1,-2,1,-1,-9,-59,-474,-4560,-50364,-625385,
 -8622658,-130751886,-2163331779,-38793751015,
 -749691306018,-15535914341831,-343749787006758,
 -8089725377931547,-201801866906374263,
 -5319643146604299835,-147774950436327236681]