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A196868 as a simple table

na(n)
01
16
2-18
3144
4-1026
510368
6-91044
7995328
8-9630090
9109486080
10-1120744188
1113042778112
12-138540597588
131637370298368
14-17853248637000
15213325958873088
16-2371846639850586
1728573129903177728
18-322526246042905740
193910007249908531200
20-44670671340291807228

[1,6,-18,144,-1026,10368,-91044,995328,-9630090,
 109486080,-1120744188,13042778112,-138540597588,
 1637370298368,-17853248637000,213325958873088,
 -2371846639850586,28573129903177728,
 -322526246042905740,3910007249908531200,
 -44670671340291807228]