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A217154
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
2
10
14
11
62
12
235
13
821
14
2868
15
10193
16
36404
17
130174
18
466913
19
1681999
20
6083873
[0,0,0,0,0,0,0,0,2,14,62,235,821,2868,10193,36404, 130174,466913,1681999,6083873]