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A053698 as a simple table

na(n)
01
14
215
340
485
5156
6259
7400
8585
9820
101111
111464
121885
132380
142955
153616
164369
175220
186175
197240
208421
219724
2211155
2312720
2414425
2516276
2618279
2720440
2822765
2925260
3027931
3130784
3233825
3337060
3440495
3544136
3647989
3752060
3856355
3960880

[1,4,15,40,85,156,259,400,585,820,1111,1464,1885,
 2380,2955,3616,4369,5220,6175,7240,8421,9724,
 11155,12720,14425,16276,18279,20440,22765,25260,
 27931,30784,33825,37060,40495,44136,47989,52060,
 56355,60880]