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A005547
as a simple table
n
a(n)
3
3
4
52
5
575
6
5470
7
49303
8
436446
9
3850752
10
34063392
11
302790797
12
2706629188
13
24332099665
14
219940720414
[3,52,575,5470,49303,436446,3850752,34063392, 302790797,2706629188,24332099665,219940720414]