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A156809
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
34
6
154
7
978
8
9497
9
127954
10
2165291
11
42609994
12
937233306
13
22576188846
[1,2,4,11,34,154,978,9497,127954,2165291,42609994, 937233306,22576188846]