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A031721 as a simple table

na(n)
11851
27400
316647
429592
546235
666576
790615
8118352
9149787
10184920
11223751
12266280
13312507
14362432
15416055
16473376
17534395
18599112
19667527
20739640
21815451
22894960
23978167
241065072
251155675
261249976
271347975
281449672
291555067
301664160

[1851,7400,16647,29592,46235,66576,90615,118352,
 149787,184920,223751,266280,312507,362432,416055,
 473376,534395,599112,667527,739640,815451,894960,
 978167,1065072,1155675,1249976,1347975,1449672,
 1555067,1664160]