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A173558 as a simple table

na(n)
05
145
2405
34005
440010
5400005
64000005
740000010
8400000015
94000000015
1040000000015
11400000000015
124000000000010
1340000000000015
14400000000000020
154000000000000025
1640000000000000025
17400000000000000025

[5,45,405,4005,40010,400005,4000005,40000010,
 400000015,4000000015,40000000015,400000000015,
 4000000000010,40000000000015,400000000000020,
 4000000000000025,40000000000000025,
 400000000000000025]