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A220798
as a simple table
n
a(n)
1
4
2
66
3
1165
4
20578
5
363260
6
6413473
7
113229500
8
1999059559
9
35293275842
[4,66,1165,20578,363260,6413473,113229500, 1999059559,35293275842]