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A127357 as a simple table

na(n)
01
12
2-5
3-28
4-11
5230
6559
7-952
8-6935
9-5302
1051811
11151340
12-163619
13-1689298
14-1906025
1511391632
1639937489
17-22649710
18-404736821
19-605626252
202431378885
2110313394038
22-1255621889

[1,2,-5,-28,-11,230,559,-952,-6935,-5302,51811,
 151340,-163619,-1689298,-1906025,11391632,
 39937489,-22649710,-404736821,-605626252,
 2431378885,10313394038,-1255621889]