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A080632
as a simple table
n
a(n)
0
1
1
1
2
5
3
25
4
215
5
1886
6
16902
7
150442
8
1326326
9
11505339
10
96755918
11
750089528
[1,1,5,25,215,1886,16902,150442,1326326,11505339, 96755918,750089528]