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A068408 as a simple table

na(n)
10
21
35
46
516
621
725
836
941
1056
1161
1276
1381
1496
15176
16201
17376
18401
19576
20601
21625
22776
23801
24976
251376
262001
273376
284001
295376
306001
317376
328001
339376
3420001
3529376
3640001
3749376
3860001
3969376
4080001
4189376
4290625
43109376
44200001
45309376
46400001
47509376

[0,1,5,6,16,21,25,36,41,56,61,76,81,96,176,201,
 376,401,576,601,625,776,801,976,1376,2001,3376,
 4001,5376,6001,7376,8001,9376,20001,29376,40001,
 49376,60001,69376,80001,89376,90625,109376,200001,
 309376,400001,509376]