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A273768 as a simple table

na(n)
01
15
222
370
4151
5272
6441
7666
8955
91316
101757
112286
122911
133640
144481
155442
166531
177756
189125
1910646
2012327
2114176
2216201
2318410
2420811
2523412
2626221
2729246
2832495
2935976
3039697
3143666
3247891
3352380
3457141
3562182
3667511
3773136
3879065
3985306
4091867
4198756

[1,5,22,70,151,272,441,666,955,1316,1757,2286,
 2911,3640,4481,5442,6531,7756,9125,10646,12327,
 14176,16201,18410,20811,23412,26221,29246,32495,
 35976,39697,43666,47891,52380,57141,62182,67511,
 73136,79065,85306,91867,98756]