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A005519
as a simple table
n
a(n)
1
1
2
1
3
2
4
7
5
26
6
153
7
1134
8
11050
9
128987
10
1765252
11
27418060
[1,1,2,7,26,153,1134,11050,128987,1765252, 27418060]