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A158671 as a simple table

na(n)
21
34
410
523
647
7100
8202
9403
10798
111592
123171
136293
1412578
1524987
1649796
1799190
18197699
19394227
20785804
211567419
223127966
236242519
2412464093
2524887586
2649698098
2799261034
28198285886

[1,4,10,23,47,100,202,403,798,1592,3171,6293,
 12578,24987,49796,99190,197699,394227,785804,
 1567419,3127966,6242519,12464093,24887586,
 49698098,99261034,198285886]