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A012301 as a simple table

na(n)
00
12
2-8
3272
4-13568
51290752
6-181296128
736501112832
8-9859508338688
93453141256896512
10-1520147333209653248
11821912974600193441792
12-535368543762962928631808
13413509146873290771683868672

[0,2,-8,272,-13568,1290752,-181296128,36501112832,
 -9859508338688,3453141256896512,
 -1520147333209653248,821912974600193441792,
 -535368543762962928631808,
 413509146873290771683868672]