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A243796
as a simple table
n
a(n)
1
1
2
0
3
1
4
2
5
4
6
15
7
58
8
360
9
2793
10
28761
11
369545
12
5914974
13
116089531
14
2816695796
[1,0,1,2,4,15,58,360,2793,28761,369545,5914974, 116089531,2816695796]