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A012589 as a simple table

na(n)
01
10
2-1
3-6
4-19
5-20
6155
71190
86617
944664
10208375
11-904398
12-18752699
13-19097052
14694693779
15-17424099810
16-291885915727
173147952642416
1873814350009583
19-859299092152342
20-22448554968159587

[1,0,-1,-6,-19,-20,155,1190,6617,44664,208375,
 -904398,-18752699,-19097052,694693779,
 -17424099810,-291885915727,3147952642416,
 73814350009583,-859299092152342,
 -22448554968159587]