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A091117
as a simple table
n
a(n)
1
2
2
7
3
47
4
309
5
2412
6
19622
7
166212
8
1440496
9
12712315
10
113764040
11
1029518338
12
9401997001
[2,7,47,309,2412,19622,166212,1440496,12712315, 113764040,1029518338,9401997001]