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A168047
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
12
6
25
7
30
8
470
9
1224
10
57843
11
145122
12
16805481
13
5285171382
[1,2,3,4,12,25,30,470,1224,57843,145122,16805481, 5285171382]