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A057831 as a simple table

na(n)
11
25
325
4125
5625
6925
73125
85675
915625
1015845
1170625
1278125
13390625
141223375
151953125
164328125
175328475
189765625

[1,5,25,125,625,925,3125,5675,15625,15845,70625,
 78125,390625,1223375,1953125,4328125,5328475,
 9765625]