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A247820 as a simple table

na(n)
15
213
3145
4365
5841
61201
71741
82521
93961
105101
117813
128581
1313945
1414281
1514965
1641761
1742925
1873345
19139921
20229165
21245701
22265721
23276025
24289561
25298765
26341965
27351961
28353641
29367225
30414961
31595141
32601705
33676285
34697381
35711625
36740545
37942565

[5,13,145,365,841,1201,1741,2521,3961,5101,7813,
 8581,13945,14281,14965,41761,42925,73345,139921,
 229165,245701,265721,276025,289561,298765,341965,
 351961,353641,367225,414961,595141,601705,676285,
 697381,711625,740545,942565]