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A005226
as a simple table
n
a(n)
0
0
1
1
2
1
3
2
4
6
5
6
6
27
7
20
8
130
9
124
10
598
11
641
12
4850
13
4772
14
35625
15
46074
16
389839
17
487408
18
4617554
[0,1,1,2,6,6,27,20,130,124,598,641,4850,4772, 35625,46074,389839,487408,4617554]