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A155965 as a simple table

na(n)
00
15
216
339
480
5145
6240
7371
8544
9765
101040
111375
121776
132249
142800
153435
164160
174981
185904
196935
208080
219345
2210736
2312259
2413920
2515725
2617680
2719791
2822064
2924505
3027120
3129915
3232896
3336069
3439440
3543015
3646800
3750801
3855024
3959475
4064160

[0,5,16,39,80,145,240,371,544,765,1040,1375,1776,
 2249,2800,3435,4160,4981,5904,6935,8080,9345,
 10736,12259,13920,15725,17680,19791,22064,24505,
 27120,29915,32896,36069,39440,43015,46800,50801,
 55024,59475,64160]