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A266783 as a simple table

na(n)
01
15
214
330
455
591
6140
7204
8285
9385
10506
11651
12823
131024
141256
151521
161821
172158
182534
192952
203415
213925
224485
235098
245766
256491
267275
278120
289028
2910002
3011046
3112162
3213351
3314616
3415960
3517385
3618893
3720486
3822167
3923939
4025805
4127768
4229829
4331989
4434251
4536618
4639092
4741675
4844370
4947180
5050106
5153150
5256315
5359602
5463012

[1,5,14,30,55,91,140,204,285,385,506,651,823,1024,
 1256,1521,1821,2158,2534,2952,3415,3925,4485,5098,
 5766,6491,7275,8120,9028,10002,11046,12162,13351,
 14616,15960,17385,18893,20486,22167,23939,25805,
 27768,29829,31989,34251,36618,39092,41675,44370,
 47180,50106,53150,56315,59602,63012]