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A278684 as a simple table

na(n)
10
20
32
499
52102
619987
7124676
8571418
92122841
106704061
1118711691
1247235845
13109938296
14238950999
15490309398
16957267228
171790325363
183224010105
195615368229
209493358359
2115627413290
2225112609019
2339484650296
2460859027054
2592114682749
26137111560949
27200972392655

[0,0,2,99,2102,19987,124676,571418,2122841,
 6704061,18711691,47235845,109938296,238950999,
 490309398,957267228,1790325363,3224010105,
 5615368229,9493358359,15627413290,25112609019,
 39484650296,60859027054,92114682749,137111560949,
 200972392655]