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A100001
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
1
8
1
9
3
10
10
11
25
12
95
13
366
14
1433
15
5802
16
24105
17
102479
18
445577
19
1992044
[0,0,0,0,0,0,1,1,3,10,25,95,366,1433,5802,24105, 102479,445577,1992044]