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A318208
as a simple table
n
a(n)
1
0
2
3
3
4
4
69
5
1042
6
28010
7
1122773
8
93034400
9
12949799902
10
3077725091253
[0,3,4,69,1042,28010,1122773,93034400,12949799902, 3077725091253]