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A107391 as a simple table

na(n)
124
2-896
367584
4-4161536
5268959744
6-17171480576
71099645845504
8-70366596694016
94503633987108864
10-288229826395897856
1118446752869802573824
12-1180591479979922948096
1375557865977714137104384

[24,-896,67584,-4161536,268959744,-17171480576,
 1099645845504,-70366596694016,4503633987108864,
 -288229826395897856,18446752869802573824,
 -1180591479979922948096,75557865977714137104384]