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A307481 as a simple table

na(n)
1625
22500
35625
410000
515625
622500
728561
830625
940000
1050625
1162500
1275625
1383521
1490000
15105625
16114244
17122500
18140625
19142129
20160000
21180625
22202500
23225625
24250000
25257049
26275625
27302500
28330625
29334084
30360000
31390625
32422500
33455625
34456976
35490000
36525625

[625,2500,5625,10000,15625,22500,28561,30625,
 40000,50625,62500,75625,83521,90000,105625,114244,
 122500,140625,142129,160000,180625,202500,225625,
 250000,257049,275625,302500,330625,334084,360000,
 390625,422500,455625,456976,490000,525625]