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A296945
as a simple table
n
a(n)
1
1
2
8
3
45
4
620
5
37179
6
2640993
7
482228052
8
246430289779
9
233010334725043
10
513658708035556281
[1,8,45,620,37179,2640993,482228052,246430289779, 233010334725043,513658708035556281]