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A224478 as a simple table

na(n)
10
225
3875
44375
559375
6609375
72109375
837109375
9287109375
106787109375
1131787109375
12581787109375
135081787109375
1490081787109375
15240081787109375
168740081787109375
1793740081787109375
18243740081787109375
192743740081787109375
2057743740081787109375

[0,25,875,4375,59375,609375,2109375,37109375,
 287109375,6787109375,31787109375,581787109375,
 5081787109375,90081787109375,240081787109375,
 8740081787109375,93740081787109375,
 243740081787109375,2743740081787109375,
 57743740081787109375]