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A198049
as a simple table
n
a(n)
1
1
2
2
3
8
4
38
5
554
6
8027
7
260677
8
15253597
9
1429110202
10
256355182462
11
80077276797247
[1,2,8,38,554,8027,260677,15253597,1429110202, 256355182462,80077276797247]