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A006860
as a simple table
n
a(n)
1
1
2
3
3
13
4
111
5
1381
6
25623
7
678133
8
26269735
9
1447451707
10
114973020921
11
13034306495563
[1,3,13,111,1381,25623,678133,26269735,1447451707, 114973020921,13034306495563]