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A009465 as a simple table

na(n)
00
11
2-1
34
4-6
55
6195
7-2704
829652
9-331843
103601035
11-41849436
12488807814
13-6056793535
1475941139183
15-991400372208
1612952602361800
17-170364782863687
182130756803110071
19-23615067306171612
20149846016306473010

[0,1,-1,4,-6,5,195,-2704,29652,-331843,3601035,
 -41849436,488807814,-6056793535,75941139183,
 -991400372208,12952602361800,-170364782863687,
 2130756803110071,-23615067306171612,
 149846016306473010]