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A316212
as a simple table
n
a(n)
1
1
2
4
3
28
4
310
5
8943
6
273102
7
17524746
8
1966735514
9
338897042438
10
103107282046491
[1,4,28,310,8943,273102,17524746,1966735514, 338897042438,103107282046491]