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A068870
as a simple table
n
a(n)
0
1
1
1
2
1
3
2
4
7
5
26
6
147
7
1019
8
8699
9
82535
10
846042
11
9078720
[1,1,1,2,7,26,147,1019,8699,82535,846042,9078720]