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A165386 as a simple table

n a(n)
2 3
3 40
4 305
5 1622
6 6868
7 25036
8 82224
9 250208
10 718536
11 1972132
12 5220384
13 13417184
14 33652952
15 82699012
16 199729888
17 475260768
18 1116459752
19 2593550148
20 5965976992
21 13605076608
22 30787314104
23 69191005796
24 154539160288
25 343241755840

[3,40,305,1622,6868,25036,82224,250208,718536,
 1972132,5220384,13417184,33652952,82699012,
 199729888,475260768,1116459752,2593550148,
 5965976992,13605076608,30787314104,69191005796,
 154539160288,343241755840]

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Last modified May 23 23:42 EDT 2022. Contains 353993 sequences. (Running on oeis4.)