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A008983 as a simple table

n a(n)
0 1
1 2
2 5
3 20
4 82
5 435
6 2645
7 18489
8 141326
9 1153052
10 9819315
11 86305315
12 776868505 

[1,2,5,20,82,435,2645,18489,141326,1153052,
 9819315,86305315,776868505]

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Last modified August 14 00:08 EDT 2024. Contains 375146 sequences. (Running on oeis4.)