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A006219
as a simple table
n
a(n)
3
3
4
8
5
25
6
89
7
357
8
1602
9
7959
10
43127
11
250591
12
1537051
13
9827077
[3,8,25,89,357,1602,7959,43127,250591,1537051, 9827077]