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A294287 as a simple table

na(n)
10
20
39
428
5100
6198
7441
8720
91296
101900
113025
124140
136084
147938
1511025
1613888
1718496
1822680
1929241
2035100
2144100
2252030
2364009
2474448
2590000
26103428
27123201
28140140
29164836
30185850
31216225
32241920
33278784
34309808
35354025
36391068
37443556
38487350
39549081

[0,0,9,28,100,198,441,720,1296,1900,3025,4140,
 6084,7938,11025,13888,18496,22680,29241,35100,
 44100,52030,64009,74448,90000,103428,123201,
 140140,164836,185850,216225,241920,278784,309808,
 354025,391068,443556,487350,549081]