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A301912 as a simple table

na(n)
10
21
35
425
576
6376
7500
8625
9876
101876
112500
125001
135625
149376
1515625
1625001
1740625
1850001
1962500
2065625
2171876
2275001
2390625
24109376
25171876
26265625
27375001
28390625
29500001
30765625
31875001
32890625
331171876
342265625
352890625
364062500
374375001
385000001

[0,1,5,25,76,376,500,625,876,1876,2500,5001,5625,
 9376,15625,25001,40625,50001,62500,65625,71876,
 75001,90625,109376,171876,265625,375001,390625,
 500001,765625,875001,890625,1171876,2265625,
 2890625,4062500,4375001,5000001]