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A079468
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
89
7
446
8
2724
9
19877
10
190403
11
2605863
12
53510680
13
1624371850
[1,1,2,6,20,89,446,2724,19877,190403,2605863, 53510680,1624371850]