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A257275
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
735
11
18432
12
442368
13
3682784876146817236992
[1,2,3,4,5,6,7,8,9,735,18432,442368, 3682784876146817236992]