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A009567 as a simple table

na(n)
00
11
2-1
32
4-8
531
6-136
7692
8-3968
925261
10-176896
111351382
12-11184128
1399680491
14-951878656
159695756072
16-104932671488
171202439837721
18-14544442556416
19185185594118762
20-2475749026562048
2134674437196568951

[0,1,-1,2,-8,31,-136,692,-3968,25261,-176896,
 1351382,-11184128,99680491,-951878656,9695756072,
 -104932671488,1202439837721,-14544442556416,
 185185594118762,-2475749026562048,
 34674437196568951]