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A117256 as a simple table

na(n)
01
11
21
3-10
45
51
6750
7-250
825
91
10-328125
1193750
12-6250
13125
141
15779296875
16-205078125
1711718750
18-156250
19625
201
21-9741210937500
222435302734375
23-128173828125
241464843750
25-3906250
263125
271
28630569458007812500
29-152206420898437500
307610321044921875

[1,1,1,-10,5,1,750,-250,25,1,-328125,93750,-6250,
 125,1,779296875,-205078125,11718750,-156250,625,1,
 -9741210937500,2435302734375,-128173828125,
 1464843750,-3906250,3125,1,630569458007812500,
 -152206420898437500,7610321044921875]