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A191590 as a simple table

na(n)
20
30
43
526
650
7133
8196
9375
10806
111001
121768
132451
142850
153773
165500
177686
188526
1911408
2013651
2114875
2218981
2322100
2427391
2535673
2640376
2742875
2848178
2950986
3056925
3181313
3289376
33102443
34107066
35132276
36137751
37155078
38173800
39187083
40208250
41230956
42238876
43281201

[0,0,3,26,50,133,196,375,806,1001,1768,2451,2850,
 3773,5500,7686,8526,11408,13651,14875,18981,22100,
 27391,35673,40376,42875,48178,50986,56925,81313,
 89376,102443,107066,132276,137751,155078,173800,
 187083,208250,230956,238876,281201]