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A091096 as a simple table

na(n)
01
15
2-15
3125
4-375
53125
6-9375
778125
8-234375
91953125
10-5859375
1148828125
12-146484375
131220703125
14-3662109375
1530517578125
16-91552734375
17762939453125
18-2288818359375
1919073486328125
20-57220458984375
21476837158203125
22-1430511474609375

[1,5,-15,125,-375,3125,-9375,78125,-234375,
 1953125,-5859375,48828125,-146484375,1220703125,
 -3662109375,30517578125,-91552734375,762939453125,
 -2288818359375,19073486328125,-57220458984375,
 476837158203125,-1430511474609375]