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A030128
as a simple table
n
a(n)
1
1
2
0
3
1
4
0
5
0
6
0
7
30
8
0
9
840
10
0
11
0
12
0
13
1197504000
14
0
15
60281712691200
16
0
17
0
18
0
19
1348410350618155344199680000
[1,0,1,0,0,0,30,0,840,0,0,0,1197504000,0, 60281712691200,0,0,0,1348410350618155344199680000]