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A118100
as a simple table
n
a(n)
0
1
1
2
2
5
3
17
4
75
5
400
6
2543
7
19834
8
241639
9
11787482
10
3530717819
[1,2,5,17,75,400,2543,19834,241639,11787482, 3530717819]
