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A015638 as a simple table

na(n)
20
33
49
528
650
7105
8169
9279
10406
11625
12839
131202
141570
152086
162646
173461
184219
195358
206452
217899
229381
2311404
2413240
2515805
2618272
2721383
2824461
2928520
3032107
3137066
3241706
3347395
3452968
3559990
3666312
3774747
3882553
3991969
40100989
41112468

[0,3,9,28,50,105,169,279,406,625,839,1202,1570,
 2086,2646,3461,4219,5358,6452,7899,9381,11404,
 13240,15805,18272,21383,24461,28520,32107,37066,
 41706,47395,52968,59990,66312,74747,82553,91969,
 100989,112468]