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A282627 as a simple table

n a(n)
0 1
1 2
2 2
3 -4
4 0
5 80
6 -560
7 0
8 49280
9 -582400
10 0
11 117286400
12 -1947545600
13 0
14 701372672000
15 -14996101120000
16 0
17 8461359915008000
18 -221282468126720000
19 0
20 180057738991370240000
21 -5567466898068275200000
22 0
23 6171659061668206346240000
24 -220248990487580966912000000
25 0

[1,2,2,-4,0,80,-560,0,49280,-582400,0,117286400,
 -1947545600,0,701372672000,-14996101120000,0,
 8461359915008000,-221282468126720000,0,
 180057738991370240000,-5567466898068275200000,0,
 6171659061668206346240000,
 -220248990487580966912000000,0]

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Last modified June 25 16:08 EDT 2022. Contains 354851 sequences. (Running on oeis4.)