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A222787
as a simple table
n
a(n)
1
1
2
3
3
34
4
5896
5
1615706
6
8113737592
7
39461160617203
8
3271351045573714833
9
264112864034567015904268
[1,3,34,5896,1615706,8113737592,39461160617203, 3271351045573714833,264112864034567015904268]