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A283335 as a simple table

na(n)
01
1-1
2-2
3-7
4-54
5-544
6-7005
7-108220
8-1958263
9-40629205
10-951376217
11-24826365255
12-714568797261
13-22491957589783
14-768651303338761
15-28344950796904518
16-1121910285249842486
17-47442295013058570884
18-2134673855370621621400

[1,-1,-2,-7,-54,-544,-7005,-108220,-1958263,
 -40629205,-951376217,-24826365255,-714568797261,
 -22491957589783,-768651303338761,
 -28344950796904518,-1121910285249842486,
 -47442295013058570884,-2134673855370621621400]