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A242791
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
11
6
34
7
98
8
408
9
1957
10
12740
11
108649
12
1281776
13
20787104
[1,1,2,6,11,34,98,408,1957,12740,108649,1281776, 20787104]