A012697 - OEIS

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A012697 as a simple table

n	a(n)
0	1
1	0
2	2
3	-3
4	28
5	-110
6	1058
7	-6804
8	75024
9	-664488
10	8456712
11	-94737720
12	1378535112
13	-18587872368
14	305610292752
15	-4802794952760
16	88232994448128
17	-1580181612876864
18	32119507894881216
19	-644756418530970624

[1,0,2,-3,28,-110,1058,-6804,75024,-664488, 8456712,-94737720,1378535112,-18587872368, 305610292752,-4802794952760,88232994448128, -1580181612876864,32119507894881216, -644756418530970624]