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A085481
as a simple table
n
a(n)
1
1
2
3
3
12
4
45
5
171
6
648
7
2457
8
9315
9
35316
10
133893
11
507627
12
1924560
13
7296561
[1,3,12,45,171,648,2457,9315,35316,133893,507627, 1924560,7296561]