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A079486
as a simple table
n
a(n)
1
3
2
15
3
103
4
879
5
8787
6
99061
7
1227369
8
16409937
9
233588249
10
3504149013
11
54963273921
12
895797910129
[3,15,103,879,8787,99061,1227369,16409937, 233588249,3504149013,54963273921,895797910129]