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A203246 as a simple table

na(n)
21
35
413
531
658
7106
8170
9270
10395
11575
12791
131085
141428
151876
162388
173036
183765
194665
205665
216875
228206
239790
2411518
2513546
2615743
2718291
2821035
2924185
3027560
3131400
3235496
3340120
3445033
3550541
3656373
3762871
3869730
3977330
4085330
4194150

[1,5,13,31,58,106,170,270,395,575,791,1085,1428,
 1876,2388,3036,3765,4665,5665,6875,8206,9790,
 11518,13546,15743,18291,21035,24185,27560,31400,
 35496,40120,45033,50541,56373,62871,69730,77330,
 85330,94150]