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A273905 as a simple table

na(n)
21
32
43
55
69
715
827
946
1083
11143
12259
13450
14817
151429
162599
174570
188323
1914698
2026797
2147491
2286659
23154042
24281287
25501283
26915907
271635835
282990383
295351138
309786369
3117541671
3232092959
3357610988
34105435607
35189521640
36346950321
37624389105

[1,2,3,5,9,15,27,46,83,143,259,450,817,1429,2599,
 4570,8323,14698,26797,47491,86659,154042,281287,
 501283,915907,1635835,2990383,5351138,9786369,
 17541671,32092959,57610988,105435607,189521640,
 346950321,624389105]