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A186669
as a simple table
n
a(n)
1
0
2
6
3
68
4
724
5
7126
6
67537
7
667927
8
6668357
9
66668807
10
666669258
11
6666669682
[0,6,68,724,7126,67537,667927,6668357,66668807, 666669258,6666669682]