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A052745 as a simple table

n a(n)
0 0
1 0
2 0
3 6
4 24
5 110
6 600
7 3836
8 28224
9 235224
10 2191680
11 22584672
12 255087360
13 3134139840
14 41620400640
15 594082771200
16 9070900715520
17 147531542054400
18 2546434166169600
19 46489412442009600
20 895079522340864000
21 18125736166340812800
22 385129713617510400000

[0,0,0,6,24,110,600,3836,28224,235224,2191680,
 22584672,255087360,3134139840,41620400640,
 594082771200,9070900715520,147531542054400,
 2546434166169600,46489412442009600,
 895079522340864000,18125736166340812800,
 385129713617510400000]

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Last modified September 19 03:31 EDT 2021. Contains 347550 sequences. (Running on oeis4.)