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A102020
as a simple table
n
a(n)
1
0
2
1
3
4
4
6
5
18
6
19
7
27
8
57
9
249
10
396
11
7590
12
32715
13
70977
14
83586
[0,1,4,6,18,19,27,57,249,396,7590,32715,70977, 83586]