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A273566 as a simple table

na(n)
01
15
218
346
495
5176
6284
7425
8605
9862
101170
111535
121963
132480
143048
153673
164361
175258
186254
197355
208567
219916
2211364
2312917
2414581
2516490
2618522
2720683
2822979
2925496
3028064
3130689
3233377
3336706
3440230
3543955
3647887
3752052
3856412
3960973
4065741
4170850

[1,5,18,46,95,176,284,425,605,862,1170,1535,1963,
 2480,3048,3673,4361,5258,6254,7355,8567,9916,
 11364,12917,14581,16490,18522,20683,22979,25496,
 28064,30689,33377,36706,40230,43955,47887,52052,
 56412,60973,65741,70850]