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A305837 as a simple table

na(n)
01
15
225
31
4125
510
6625
775
81
93125
10500
1115
1215625
133125
14150
151
1678125
1718750
181250
1920
20390625
21109375
229375
23250
241
251953125
26625000
2765625
282500
2925
309765625
313515625
32437500
3321875
34375
351
3648828125
3719531250
382812500
39175000
404375
4130
42244140625
43107421875
4417578125
451312500
4643750
47525
481

[1,5,25,1,125,10,625,75,1,3125,500,15,15625,3125,
 150,1,78125,18750,1250,20,390625,109375,9375,250,
 1,1953125,625000,65625,2500,25,9765625,3515625,
 437500,21875,375,1,48828125,19531250,2812500,
 175000,4375,30,244140625,107421875,17578125,
 1312500,43750,525,1]