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A009566 as a simple table

na(n)
00
11
2-2
38
4-47
5359
6-3349
736756
8-462972
96574704
10-103861896
111805930928
12-34267701720
13704555489832
14-15601914340440
15370195510608192
16-9369769657984128
17251979258929744448
18-7175127496412091456

[0,1,-2,8,-47,359,-3349,36756,-462972,6574704,
 -103861896,1805930928,-34267701720,704555489832,
 -15601914340440,370195510608192,-9369769657984128,
 251979258929744448,-7175127496412091456]