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A137884
as a simple table
n
a(n)
1
2
2
10
3
144
4
6094
5
530068
6
84884502
7
22386625160
8
9099505341966
9
5391573454232108
10
4469933447616285558
[2,10,144,6094,530068,84884502,22386625160, 9099505341966,5391573454232108, 4469933447616285558]