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A117257 as a simple table

na(n)
01
11
2-10
3750
4-328125
5779296875
6-9741210937500
7630569458007812500
8-209368765354156494140625
9354400253854691982269287109375
10-3045627181563759222626686096191406250
11132489108572997338342247530817985534667968750

[1,1,-10,750,-328125,779296875,-9741210937500,
 630569458007812500,-209368765354156494140625,
 354400253854691982269287109375,
 -3045627181563759222626686096191406250,
 132489108572997338342247530817985534667968750]