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A222398 as a simple table

n a(n)
1 3
2 9
3 35
4 162
5 717
6 8803
7 55761
8 648643
9 4706538
10 56003424
11 406023424
12 4784210119
13 35733523091
14 409997141918
15 3135766366849
16 35275686696609
17 275409726982013
18 3040622473638517
19 24210569242226366
20 262678073944123860

[3,9,35,162,717,8803,55761,648643,4706538,
 56003424,406023424,4784210119,35733523091,
 409997141918,3135766366849,35275686696609,
 275409726982013,3040622473638517,
 24210569242226366,262678073944123860]

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Last modified October 28 02:07 EDT 2021. Contains 348307 sequences. (Running on oeis4.)