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A173422
as a simple table
n
a(n)
0
1
1
2
2
3
3
5
4
11
5
31
6
130
7
776
8
6750
9
78635
10
1131440
11
18580739
12
331953037
[1,2,3,5,11,31,130,776,6750,78635,1131440, 18580739,331953037]