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A127212 as a simple table

na(n)
15
275
3500
44375
534375
6281250
72265625
818359375
9148437500
101201171875
119716796875
1278613281250
13635986328125
145145263671875
1541625976562500
16336761474609375
172724456787109375
1822041320800781250
19178318023681640625

[5,75,500,4375,34375,281250,2265625,18359375,
 148437500,1201171875,9716796875,78613281250,
 635986328125,5145263671875,41625976562500,
 336761474609375,2724456787109375,
 22041320800781250,178318023681640625]