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A219691
as a simple table
n
a(n)
1
28
2
98
3
1506
4
18486
5
220182
6
2706117
7
35011623
8
461414270
9
5979059010
10
75005582670
[28,98,1506,18486,220182,2706117,35011623, 461414270,5979059010,75005582670]