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A079456
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
17
6
67
7
299
8
1726
9
12405
10
112234
11
1265629
12
17716712
13
306896676
14
6579771024
[1,1,2,6,17,67,299,1726,12405,112234,1265629, 17716712,306896676,6579771024]