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A153305 as a simple table

n a(n)
0 1
1 3
2 15
3 109
4 1008
5 10983
6 135097
7 1828425
8 26777775
9 419530384
10 6973851684
11 122248585620
12 2249238083514
13 43274933036838
14 868047525689328
15 18108325893968859
16 392039367345646323
17 8792515088387598651

[1,3,15,109,1008,10983,135097,1828425,26777775,
 419530384,6973851684,122248585620,2249238083514,
 43274933036838,868047525689328,18108325893968859,
 392039367345646323,8792515088387598651]

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Last modified October 19 03:10 EDT 2021. Contains 348073 sequences. (Running on oeis4.)