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A299568
as a simple table
n
a(n)
1
0
2
3
3
15
4
78
5
766
6
17389
7
784334
8
46965400
9
5736969146
10
1349947112124
[0,3,15,78,766,17389,784334,46965400,5736969146, 1349947112124]