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A203213
as a simple table
n
a(n)
1
1
2
5
3
20
4
284
5
4778
6
200334
7
15899780
8
2217594703
9
664289549854
[1,5,20,284,4778,200334,15899780,2217594703, 664289549854]
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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)