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A143885
as a simple table
n
a(n)
0
1
1
2
2
3
3
15
4
52
5
383
6
2273
7
28764
8
295391
9
6544311
10
116636234
[1,2,3,15,52,383,2273,28764,295391,6544311, 116636234]