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A119716
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
4
8
11
9
35
10
101
11
290
12
804
13
2256
14
6296
15
17689
16
49952
17
142016
18
406330
19
1169356
20
3390052
[0,0,0,0,0,0,4,11,35,101,290,804,2256,6296,17689, 49952,142016,406330,1169356,3390052]