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A012039 as a simple table

na(n)
01
1-1
21
3111
4-9407
5957791
6-131065791
723876150351
8-5645293077119
91689130316350143
10-625455343415905919
11281176376077651011119
12-150982531394396522439999
1395493861079696805301099551

[1,-1,1,111,-9407,957791,-131065791,23876150351,
 -5645293077119,1689130316350143,
 -625455343415905919,281176376077651011119,
 -150982531394396522439999,
 95493861079696805301099551]