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A139273 as a simple table

na(n)
00
15
226
363
4116
5185
6270
7371
8488
9621
10770
11935
121116
131313
141526
151755
162000
172261
182538
192831
203140
213465
223806
234163
244536
254925
265330
275751
286188
296641
307110
317595
328096
338613
349146
359695
3610260
3710841
3811438
3912051
4012680

[0,5,26,63,116,185,270,371,488,621,770,935,1116,
 1313,1526,1755,2000,2261,2538,2831,3140,3465,3806,
 4163,4536,4925,5330,5751,6188,6641,7110,7595,8096,
 8613,9146,9695,10260,10841,11438,12051,12680]