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A031731 as a simple table

na(n)
12811
211240
325287
444952
570235
6101136
7137655
8179792
9227547
10280920
11339911
12404520
13474747
14550592
15632055
16719136
17811835
18910152
191014087
201123640
211238811
221359600
231486007
241618032
251755675
261898936
272047815
282202312
292362427

[2811,11240,25287,44952,70235,101136,137655,
 179792,227547,280920,339911,404520,474747,550592,
 632055,719136,811835,910152,1014087,1123640,
 1238811,1359600,1486007,1618032,1755675,1898936,
 2047815,2202312,2362427]