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A186070
as a simple table
n
a(n)
1
1
2
1
3
1
4
13
5
13
6
608
7
4094
8
1875397
9
143639306
10
5613099946
11
20207317759
12
1474035260669
[1,1,1,13,13,608,4094,1875397,143639306, 5613099946,20207317759,1474035260669]