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A234209
as a simple table
n
a(n)
1
72
2
1540
3
40384
4
2047712
5
125726800
6
20127064876
7
3176900588064
8
1963380942087312
[72,1540,40384,2047712,125726800,20127064876, 3176900588064,1963380942087312]