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A298322
as a simple table
n
a(n)
1
1
2
5
3
22
4
382
5
17984
6
2614097
7
1019874462
8
970377749534
9
2360675859823673
[1,5,22,382,17984,2614097,1019874462,970377749534, 2360675859823673]