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A203287 as a simple table

na(n)
15
221
369
4188
5444
6944
71844
83369
95825
109621
1115285
1223492
1335080
1451084
1572756
16101601
17139401
18188257
19250613
20329304
21427584
22549176
23698304
24879749
251098881
261361721
271674977
282046108
292483364
302995856
313593596
324287573
335089797
346013377

[5,21,69,188,444,944,1844,3369,5825,9621,15285,
 23492,35080,51084,72756,101601,139401,188257,
 250613,329304,427584,549176,698304,879749,1098881,
 1361721,1674977,2046108,2483364,2995856,3593596,
 4287573,5089797,6013377]