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A140288 as a simple table

na(n)
15
225
3125
43125
553125
6453125
74453125
814453125
9314453125
102314453125
1122314453125
12122314453125
134122314453125
1444122314453125
15444122314453125
164444122314453125
1754444122314453125
18254444122314453125
191254444122314453125
2021254444122314453125

[5,25,125,3125,53125,453125,4453125,14453125,
 314453125,2314453125,22314453125,122314453125,
 4122314453125,44122314453125,444122314453125,
 4444122314453125,54444122314453125,
 254444122314453125,1254444122314453125,
 21254444122314453125]