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A359519
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
1
9
2
10
16
11
70
12
378
13
1772
14
8456
15
38623
16
174400
17
771944
18
3378937
[0,0,0,0,0,0,0,1,2,16,70,378,1772,8456,38623, 174400,771944,3378937]