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A217375
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
10
8
11
40
12
168
13
604
14
2076
15
7320
16
26132
17
93352
18
333992
19
1199716
20
4329180
[0,0,0,0,0,0,0,0,0,8,40,168,604,2076,7320,26132, 93352,333992,1199716,4329180]