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A221140 as a simple table

na(n)
10
21
35
415
535
675
7140
8259
9435
10735
111155
121841
132765
144200
156125
168975
1712731
1818179
1925235
2035180
2148055
2265681
2388299
24118895
25157690
26209230
27274510
28359779
29466970
30605740
31778860
321000462
331276044
341624845
352056355
362598855
373265851
384097763
395117350

[0,1,5,15,35,75,140,259,435,735,1155,1841,2765,
 4200,6125,8975,12731,18179,25235,35180,48055,
 65681,88299,118895,157690,209230,274510,359779,
 466970,605740,778860,1000462,1276044,1624845,
 2056355,2598855,3265851,4097763,5117350]