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A164919
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
2
5
5
6
35
7
219
8
1666
9
14498
10
148790
11
1768732
12
24029714
13
366939032
14
6213299362
15
115388854837
[0,0,0,0,2,5,35,219,1666,14498,148790,1768732, 24029714,366939032,6213299362,115388854837]