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A126089 as a simple table

n a(n)
0 1
1 -4
2 4
3 0
4 -48
5 -960
6 -20160
7 -483840
8 -13305600
9 -415134720
10 -14529715200
11 -564583219200
12 -24135932620800
13 -1126343522304000
14 -56992982228582400
15 -3108708121559040000
16 -181859425111203840000
17 -11359219476176732160000
18 -754576722346025779200000

[1,-4,4,0,-48,-960,-20160,-483840,-13305600,
 -415134720,-14529715200,-564583219200,
 -24135932620800,-1126343522304000,
 -56992982228582400,-3108708121559040000,
 -181859425111203840000,-11359219476176732160000,
 -754576722346025779200000]

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Last modified May 12 10:54 EDT 2021. Contains 343821 sequences. (Running on oeis4.)