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A205671 as a simple table

na(n)
11
2-4
340
4-656
515008
6-440896
715821440
8-670763264
932806349312
10-1818238034944
11112618994575360
12-7709249275990016
13577965256979161088
14-47096523207273496576
154144654003816138178560
16-391753493233853247586304

[1,-4,40,-656,15008,-440896,15821440,-670763264,
 32806349312,-1818238034944,112618994575360,
 -7709249275990016,577965256979161088,
 -47096523207273496576,4144654003816138178560,
 -391753493233853247586304]