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A298541
as a simple table
n
a(n)
1
0
2
4
3
109
4
4771
5
575754
6
173576070
7
128132389259
8
235203378815314
9
1070188767920257936
[0,4,109,4771,575754,173576070,128132389259, 235203378815314,1070188767920257936]