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A208822
as a simple table
n
a(n)
1
1
2
6
3
18
4
131
5
905
6
7582
7
65134
8
587682
9
5416897
10
50959134
11
486441796
12
4701644087
13
45911470685
[1,6,18,131,905,7582,65134,587682,5416897, 50959134,486441796,4701644087,45911470685]