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A273781 as a simple table

na(n)
01
15
226
374
4155
5276
6445
7670
8959
91320
101761
112290
122915
133644
144485
155446
166535
177760
189129
1910650
2012331
2114180
2216205
2318414
2420815
2523416
2626225
2729250
2832499
2935980
3039701
3143670
3247895
3352384
3457145
3562186
3667515
3773140
3879069
3985310
4091871
4198760

[1,5,26,74,155,276,445,670,959,1320,1761,2290,
 2915,3644,4485,5446,6535,7760,9129,10650,12331,
 14180,16205,18414,20815,23416,26225,29250,32499,
 35980,39701,43670,47895,52384,57145,62186,67515,
 73140,79069,85310,91871,98760]