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A192331
as a simple table
n
a(n)
1
0
2
1
3
4
4
12
5
57
6
567
7
7375
8
140117
9
4140556
10
183075048
11
11961299512
12
1168852060539
[0,1,4,12,57,567,7375,140117,4140556,183075048, 11961299512,1168852060539]