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A127383
as a simple table
n
a(n)
0
1
1
1
2
1
3
2
4
6
5
15
6
46
7
141
8
446
9
1427
10
4722
11
15884
12
54224
13
187380
[1,1,1,2,6,15,46,141,446,1427,4722,15884,54224, 187380]