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A282626 as a simple table

n a(n)
0 1
1 1
2 0
3 -2
4 8
5 0
6 -320
7 2800
8 0
9 -344960
10 4659200
11 0
12 -1172864000
13 21423001600
14 0
15 -9117844736000
16 209945415680000
17 0
18 -135381758640128000
19 3761801958154240000
20 0
21 -3421097040836034560000
22 111349337961365504000000
23 0
24 -135776499356700539617280000

[1,1,0,-2,8,0,-320,2800,0,-344960,4659200,0,
 -1172864000,21423001600,0,-9117844736000,
 209945415680000,0,-135381758640128000,
 3761801958154240000,0,-3421097040836034560000,
 111349337961365504000000,0,
 -135776499356700539617280000]

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Last modified August 13 20:49 EDT 2022. Contains 356107 sequences. (Running on oeis4.)