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A293319 as a simple table

na(n)
02
15
210
320
441
583
6167
7335
8670
91340
102680
115361
1210723
1321446
1442893
1585787
16171575
17343150
18686301
191372603
202745207
215490415
2210980830
2321961660
2443923321
2587846643
26175693286
27351386573
28702773147
291405546295
302811092590
315622185180
3211244370361

[2,5,10,20,41,83,167,335,670,1340,2680,5361,10723,
 21446,42893,85787,171575,343150,686301,1372603,
 2745207,5490415,10980830,21961660,43923321,
 87846643,175693286,351386573,702773147,1405546295,
 2811092590,5622185180,11244370361]