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A307909 as a simple table

na(n)
21
31
42
53
65
78
815
927
1052
1199
12195
13382
14757
151499
162986
175945
1811865
1923678
2047309
2194519
22188942
23377689
24755191
251510000
263019625
276038493
2812076244
2924150989
3048300491
3196597996
32193193033
33386380121
34772754322
351545496779
363090981745
376181939812

[1,1,2,3,5,8,15,27,52,99,195,382,757,1499,2986,
 5945,11865,23678,47309,94519,188942,377689,755191,
 1510000,3019625,6038493,12076244,24150989,
 48300491,96597996,193193033,386380121,772754322,
 1545496779,3090981745,6181939812]