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A297916
as a simple table
n
a(n)
1
0
2
4
3
109
4
4771
5
575754
6
173216147
7
127727388127
8
234129105357081
9
1063459512165657876
[0,4,109,4771,575754,173216147,127727388127, 234129105357081,1063459512165657876]