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A318258 as a simple table

na(n)
00
11
2-125
3249250
4-2886735625
5122209131374375
6-14455143383196875000
74006210678487307667578125
8-2297417123000769120910212890625
92485076260705905645263720799941406250
10-4719878705811419698488114573981055908203125

[0,1,-125,249250,-2886735625,122209131374375,
 -14455143383196875000,4006210678487307667578125,
 -2297417123000769120910212890625,
 2485076260705905645263720799941406250,
 -4719878705811419698488114573981055908203125]