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A054768 as a simple table

n a(n)
0 -2
1 1
2 1
3 9
4 72
5 792
6 10512
7 165168
8 2992608
9 61445088
10 1409857920
11 35751525120
12 992877886080
13 29970166769280
14 976990865518080
15 34206887786803200
16 1280236466132467200
17 51004766655793036800
18 2155155171665039308800

[-2,1,1,9,72,792,10512,165168,2992608,61445088,
 1409857920,35751525120,992877886080,
 29970166769280,976990865518080,34206887786803200,
 1280236466132467200,51004766655793036800,
 2155155171665039308800]

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Last modified October 16 18:58 EDT 2018. Contains 316271 sequences. (Running on oeis4.)