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A012892 as a simple table

na(n)
00
12
2-1
39
4-30
5127
6-855
75852
8-46452
9422101
10-4210605
1146275042
12-555647334
137222813951
14-101114520507
151516765931792
16-24268153134120
17412557147859433
18-7426039662804249
19141094759708106686

[0,2,-1,9,-30,127,-855,5852,-46452,422101,
 -4210605,46275042,-555647334,7222813951,
 -101114520507,1516765931792,-24268153134120,
 412557147859433,-7426039662804249,
 141094759708106686]