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A215118 as a simple table

na(n)
11
25
325
4625
518125
6628125
725390625
81158515625
958308203125
103190470703125
11187941103515625
1211832996337890625
13791834056298828125
1456063448811767578125
154184231129351806640625
16328154000925299072265625
1726970505516268341064453125
182317475342690856231689453125

[1,5,25,625,18125,628125,25390625,1158515625,
 58308203125,3190470703125,187941103515625,
 11832996337890625,791834056298828125,
 56063448811767578125,4184231129351806640625,
 328154000925299072265625,
 26970505516268341064453125,
 2317475342690856231689453125]