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A168150 as a simple table

na(n)
00
11
2-1
33
4-8
520
6-48
7112
8-256
9576
10-1280
112816
12-6144
1313312
14-28672
1561440
16-131072
17278528
18-589824
191245184
20-2621440
215505024
22-11534336
2324117248
24-50331648
25104857600
26-218103808
27452984832
28-939524096
291946157056
30-4026531840
318321499136
32-17179869184

[0,1,-1,3,-8,20,-48,112,-256,576,-1280,2816,-6144,
 13312,-28672,61440,-131072,278528,-589824,1245184,
 -2621440,5505024,-11534336,24117248,-50331648,
 104857600,-218103808,452984832,-939524096,
 1946157056,-4026531840,8321499136,-17179869184]