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A009074 as a simple table

na(n)
01
1-1
20
32
4-12
544
6-216
7944
8-5296
927632
10-168128
11975072
12-5391680
1327882048
1438412672
15-1986004224
1661881368832
17-850359527680
1816576603568128
19-222801125934592
204120672559178752
21-57863671042155520

[1,-1,0,2,-12,44,-216,944,-5296,27632,-168128,
 975072,-5391680,27882048,38412672,-1986004224,
 61881368832,-850359527680,16576603568128,
 -222801125934592,4120672559178752,
 -57863671042155520]