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A331659
as a simple table
n
a(n)
1
0
2
1
3
1520
4
9317
5
31221
6
325374626148
7
535755688021
8
1404720439053
9
3883018238329
10
16166305650060
[0,1,1520,9317,31221,325374626148,535755688021, 1404720439053,3883018238329,16166305650060]