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A302454
as a simple table
n
a(n)
1
1
2
2
3
18
4
10
5
924
6
5266
7
404761
8
26036557
9
4110999261
10
1386699669527
[1,2,18,10,924,5266,404761,26036557,4110999261, 1386699669527]