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A053807 as a simple table

na(n)
10
20
34
49
520
625
749
849
984
1090
11129
12121
13209
14169
15249
16259
17340
18289
19454
20361
21545
22499
23609
24529
25849
26650
27849
28819
291049
30841
311299
32961
331364
341219
351449
361299
371910
381369
391809
401699
412209
421681
432499
441849
452561
462365
472649

[0,0,4,9,20,25,49,49,84,90,129,121,209,169,249,
 259,340,289,454,361,545,499,609,529,849,650,849,
 819,1049,841,1299,961,1364,1219,1449,1299,1910,
 1369,1809,1699,2209,1681,2499,1849,2561,2365,2649]