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A009793 as a simple table

na(n)
01
1-6
272
3-1904
489344
5-6445824
6660602880
7-91175548928
816301080281088
9-3664597991424000
101011727950085619712
11-336514395583207178240
12132722531082033166286848
13-61245140659205655654039552

[1,-6,72,-1904,89344,-6445824,660602880,
 -91175548928,16301080281088,-3664597991424000,
 1011727950085619712,-336514395583207178240,
 132722531082033166286848,
 -61245140659205655654039552]