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A067057 as a simple table

n a(n)
1 0
2 2
3 22
4 140
5 680
6 2800
7 10304
8 34944
9 111360
10 337920
11 985600
12 2782208
13 7641088
14 20500480
15 53903360
16 139264000
17 354287616
18 889061376
19 2203975680
20 5404098560
21 13120307200
22 31569477632
23 75342282752
24 178467635200
25 419849830400

[0,2,22,140,680,2800,10304,34944,111360,337920,
 985600,2782208,7641088,20500480,53903360,
 139264000,354287616,889061376,2203975680,
 5404098560,13120307200,31569477632,75342282752,
 178467635200,419849830400]

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Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)