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A305169
as a simple table
n
a(n)
1
0
2
3
3
4
4
410
5
26810
6
2549718
7
1069089450
8
830801270567
9
1384315836778981
[0,3,4,410,26810,2549718,1069089450,830801270567, 1384315836778981]