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A000679
as a simple table
n
a(n)
0
1
1
1
2
2
3
5
4
14
5
51
6
267
7
2328
8
56092
9
10494213
10
49487367289
[1,1,2,5,14,51,267,2328,56092,10494213, 49487367289]