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A143880 as a simple table

n a(n)
0 1
1 2
2 3
3 15
4 36
5 383
6 1505
7 28764
8 197391
9 6544311
10 74718810 

[1,2,3,15,36,383,1505,28764,197391,6544311,
 74718810]

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Last modified May 26 04:26 EDT 2022. Contains 354074 sequences. (Running on oeis4.)