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A228317 as a simple table

na(n)
10
20
33
421
575
6195
7420
8798
91386
102250
113465
125115
137293
1410101
1513650
1618060
1723460
1829988
1937791
2047025
2157855
2270455
2385008
24101706
25120750
26142350
27166725
28194103
29224721
30258825
31296670
32338520
33384648
34435336
35490875
36551565
37617715
38689643

[0,0,3,21,75,195,420,798,1386,2250,3465,5115,7293,
 10101,13650,18060,23460,29988,37791,47025,57855,
 70455,85008,101706,120750,142350,166725,194103,
 224721,258825,296670,338520,384648,435336,490875,
 551565,617715,689643]