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A096642 as a simple table

na(n)
01
11
22
31
43
5-1
615
7-78
8632
9-6049
1068036
11-878337
1212817659
13-208803098
143758607935
15-74132077726
161590647874073

[1,1,2,1,3,-1,15,-78,632,-6049,68036,-878337,
 12817659,-208803098,3758607935,-74132077726,
 1590647874073]