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A231257 as a simple table

n a(n)
1 3
2 15
3 89
4 547
5 3381
6 20911
7 129329
8 799835
9 4946509
10 30591143
11 189187465
12 1170008467
13 7235785189
14 44748896799
15 276744502881
16 1711495152971
17 10584548667901
18 65458946997783
19 404823472069561
20 2503585087356803

[3,15,89,547,3381,20911,129329,799835,4946509,
 30591143,189187465,1170008467,7235785189,
 44748896799,276744502881,1711495152971,
 10584548667901,65458946997783,404823472069561,
 2503585087356803]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)