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A131815 as a simple table

n a(n)
0 1
1 -2
2 -12
3 -120
4 1680
5 574560
6 100457280
7 18871332480
8 4068839174400
9 997177467686400
10 265676948766028800
11 68775633656816486400
12 9975596960728285286400
13 -9408345873371957191680000
14 -16902988368910895971399680000

[1,-2,-12,-120,1680,574560,100457280,18871332480,
 4068839174400,997177467686400,265676948766028800,
 68775633656816486400,9975596960728285286400,
 -9408345873371957191680000,
 -16902988368910895971399680000]

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Last modified May 16 22:37 EDT 2022. Contains 353724 sequences. (Running on oeis4.)