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A220232 as a simple table

n a(n)
0 0
1 0
2 0
3 6
4 12
5 80
6 390
7 2352
8 15176
9 106416
10 801450
11 6446000
12 55056012
13 497109912
14 4726554014
15 47164460280
16 492470203920
17 5366715030752
18 60896862950994
19 718023996605664
20 8780720796483860
21 111182108454527880
22 1455411630641384262
23 19668592336395304808

[0,0,0,6,12,80,390,2352,15176,106416,801450,
 6446000,55056012,497109912,4726554014,47164460280,
 492470203920,5366715030752,60896862950994,
 718023996605664,8780720796483860,
 111182108454527880,1455411630641384262,
 19668592336395304808]

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Last modified December 5 20:39 EST 2021. Contains 349558 sequences. (Running on oeis4.)