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A114479 as a simple table

n a(n)
1 3
2 20
3 136
4 928
5 6336
6 43264
7 295424
8 2017280
9 13774848
10 94060544
11 642285568
12 4385800192
13 29948116992
14 204498534400
15 1396403339264
16 9535238438912
17 65110680797184
18 444603538866176
19 3035942864551936
20 20730714605486080

[3,20,136,928,6336,43264,295424,2017280,13774848,
 94060544,642285568,4385800192,29948116992,
 204498534400,1396403339264,9535238438912,
 65110680797184,444603538866176,3035942864551936,
 20730714605486080]

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Last modified February 22 23:44 EST 2020. Contains 332157 sequences. (Running on oeis4.)