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A123818
as a simple table
n
a(n)
1
1
2
3
3
31
4
412
5
6435
6
106108
7
1825803
8
32320892
9
584956651
10
10772558067
11
201219520632
[1,3,31,412,6435,106108,1825803,32320892, 584956651,10772558067,201219520632]