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A003097 as a simple table

n a(n)
2 1
3 3
4 7
5 20
6 52
7 157
8 458
9 1436
10 4531
11 14794
12 48944
13 165314

[1,3,7,20,52,157,458,1436,4531,14794,48944,165314]

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Last modified April 22 14:13 EDT 2019. Contains 322349 sequences. (Running on oeis4.)