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A123418
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
32
6
124
7
512
8
2495
9
13245
10
79734
11
538052
12
4171519
13
37767142
[1,2,4,11,32,124,512,2495,13245,79734,538052, 4171519,37767142]