A012589 - OEIS

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A012589 as a simple table

n	a(n)
0	1
1	0
2	-1
3	-6
4	-19
5	-20
6	155
7	1190
8	6617
9	44664
10	208375
11	-904398
12	-18752699
13	-19097052
14	694693779
15	-17424099810
16	-291885915727
17	3147952642416
18	73814350009583
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]