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A055738
as a simple table
n
a(n)
1
0
2
3
3
6
4
13
5
39
6
167
7
900
8
4769
9
28389
10
180530
11
1209319
12
8398279
13
60070591
14
441296837
15
3314576488
[0,3,6,13,39,167,900,4769,28389,180530,1209319, 8398279,60070591,441296837,3314576488]