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A125033
as a simple table
n
a(n)
0
1
1
1
2
2
3
7
4
36
5
248
6
2157
7
22761
8
283220
9
4068411
10
66367834
11
1213504295
12
24606397802
[1,1,2,7,36,248,2157,22761,283220,4068411, 66367834,1213504295,24606397802]