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A221753
as a simple table
n
a(n)
1
1
2
64
3
736
4
16715
5
311288
6
6168942
7
122732982
8
2429844368
9
48285624377
10
958570609399
[1,64,736,16715,311288,6168942,122732982, 2429844368,48285624377,958570609399]