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A067724 as a simple table

na(n)
115
240
375
4120
5175
6240
7315
8400
9495
10600
11715
12840
13975
141120
151275
161440
171615
181800
191995
202200
212415
222640
232875
243120
253375
263640
273915
284200
294495
304800
315115
325440
335775
346120
356475
366840
377215
387600
397995
408400
418815
429240
439675

[15,40,75,120,175,240,315,400,495,600,715,840,975,
 1120,1275,1440,1615,1800,1995,2200,2415,2640,2875,
 3120,3375,3640,3915,4200,4495,4800,5115,5440,5775,
 6120,6475,6840,7215,7600,7995,8400,8815,9240,9675]