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A006838
as a simple table
n
a(n)
2
0
3
0
4
1
5
0
6
0
7
4
8
0
9
-1
10
0
11
28
12
-1
13
-118
14
294
15
-184
16
-441
17
1486
18
-273
19
-6464
20
8969
[0,0,1,0,0,4,0,-1,0,28,-1,-118,294,-184,-441,1486, -273,-6464,8969]