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A079576
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
93
7
534
8
4291
9
47120
10
739310
11
16641941
12
539386425
[1,1,2,6,20,93,534,4291,47120,739310,16641941, 539386425]