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A013208 as a simple table

na(n)
00
11
2-2
33
4-8
545
6-272
71743
8-13568
9125625
10-1290752
1114554683
12-181296128
132473184805
14-36501112832
15579439207623
16-9859508338688
17179018972217585
18-3453141256896512
1970518070842040563

[0,1,-2,3,-8,45,-272,1743,-13568,125625,-1290752,
 14554683,-181296128,2473184805,-36501112832,
 579439207623,-9859508338688,179018972217585,
 -3453141256896512,70518070842040563]