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A219815
as a simple table
n
a(n)
1
28
2
91
3
1588
4
22017
5
283334
6
3967857
7
59065976
8
864699568
9
12174420630
10
164256040933
11
2133182509213
[28,91,1588,22017,283334,3967857,59065976, 864699568,12174420630,164256040933,2133182509213]