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A012697 as a simple table

na(n)
01
10
22
3-3
428
5-110
61058
7-6804
875024
9-664488
108456712
11-94737720
121378535112
13-18587872368
14305610292752
15-4802794952760
1688232994448128
17-1580181612876864
1832119507894881216
19-644756418530970624

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