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A243337
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
17
6
79
7
478
8
4123
9
46666
10
648758
11
10275896
12
177007433
[1,1,2,5,17,79,478,4123,46666,648758,10275896, 177007433]