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A028687 as a simple table

na(n)
11
23
316
421
545
696
7175
8288
9315
10416
11441
12640
13891
141200
151573
162016
172535
182835
193136
203825
214608
225491
236480
247581
258800
269765
2710143
2811616
2911904
3013225
3114976
3216875
3318928
3421141
3523520
3626071
3728800
3831713
3933280
4034816
4137625

[1,3,16,21,45,96,175,288,315,416,441,640,891,1200,
 1573,2016,2535,2835,3136,3825,4608,5491,6480,7581,
 8800,9765,10143,11616,11904,13225,14976,16875,
 18928,21141,23520,26071,28800,31713,33280,34816,
 37625]