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A291060
as a simple table
n
a(n)
1
1
2
4
3
30
4
361
5
7872
6
233289
7
9889000
8
547419609
9
38741698824
10
3429774361225
[1,4,30,361,7872,233289,9889000,547419609, 38741698824,3429774361225]