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A220028
as a simple table
n
a(n)
1
2
2
4
3
10
4
34
5
111
6
358
7
1165
8
3789
9
12375
10
40583
11
133632
12
441773
[2,4,10,34,111,358,1165,3789,12375,40583,133632, 441773]