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A187156 as a simple table

na(n)
10
20
320
464
5132
6224
7340
8480
9644
10832
111044
121280
131540
141824
152132
162464
172820
183200
193604
204032
214484
224960
235460
245984
256532
267104
277700
288320
298964
309632
3110324
3211040
3311780
3412544
3513332
3614144
3714980
3815840
3916724
4017632
4118564
4219520
4320500

[0,0,20,64,132,224,340,480,644,832,1044,1280,1540,
 1824,2132,2464,2820,3200,3604,4032,4484,4960,5460,
 5984,6532,7104,7700,8320,8964,9632,10324,11040,
 11780,12544,13332,14144,14980,15840,16724,17632,
 18564,19520,20500]