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A097756 as a simple table

na(n)
11
25
325
4125
565
6625
73125
815625
9325
1078125
11390625
121953125
131625
149765625
1548828125
164225
17244140625
181105
198125
201220703125
216103515625
2230517578125
2340625
24152587890625
2521125
26762939453125
273814697265625
28203125

[1,5,25,125,65,625,3125,15625,325,78125,390625,
 1953125,1625,9765625,48828125,4225,244140625,1105,
 8125,1220703125,6103515625,30517578125,40625,
 152587890625,21125,762939453125,3814697265625,
 203125]