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A231390 as a simple table

na(n)
17
28
315
420
531
652
795
8180
9351
10692
111375
122740
135471
1410932
1521855
1643700
1787391
18174772
19349535
20699060
211398111
222796212
235592415
2411184820
2522369631
2644739252
2789478495
28178956980
29357913951
30715827892
311431655775
322863311540
335726623071

[7,8,15,20,31,52,95,180,351,692,1375,2740,5471,
 10932,21855,43700,87391,174772,349535,699060,
 1398111,2796212,5592415,11184820,22369631,
 44739252,89478495,178956980,357913951,715827892,
 1431655775,2863311540,5726623071]