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A298771
as a simple table
n
a(n)
1
0
2
3
3
15
4
78
5
682
6
11320
7
484813
8
22160831
9
2093453587
10
397340932476
[0,3,15,78,682,11320,484813,22160831,2093453587, 397340932476]