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A331999 as a simple table

na(n)
18
236
3120
4252
5550
6936
71666
82280
93312
105220
116820
129324
1311726
1414448
1517625
1622048
1727081
1830744
1938190
2045440
2150589
2259092
2366815
2476896
2592150
26102414
27111240

[8,36,120,252,550,936,1666,2280,3312,5220,6820,
 9324,11726,14448,17625,22048,27081,30744,38190,
 45440,50589,59092,66815,76896,92150,102414,111240]