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A260093
as a simple table
n
a(n)
1
20
2
49
3
2096
4
5684
5
14847
6
440876
7
18770091
8
40882585915
9
5598199195808
10
35959924244180
[20,49,2096,5684,14847,440876,18770091, 40882585915,5598199195808,35959924244180]