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A234636
as a simple table
n
a(n)
2
0
3
3
4
106
5
17367
6
24601058
7
638520866656
8
169298265484672524
9
1292856744880357036357430
[0,3,106,17367,24601058,638520866656, 169298265484672524,1292856744880357036357430]