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A091230
as a simple table
n
a(n)
0
1
1
2
2
3
3
7
4
25
5
137
6
1123
7
13103
8
204045
9
4050293
10
99440273
[1,2,3,7,25,137,1123,13103,204045,4050293, 99440273]