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A049939 as a simple table

na(n)
11
21
32
45
514
624
752
8123
9345
10568
111140
122299
134697
149839
1521409
1650358
17141235
18232113
19464230
20928479
211857057
223714559
237430849
2414869238
2529778995
2659739745
27120175856
28243137792
29497430263
301039731033
312262860113

[1,1,2,5,14,24,52,123,345,568,1140,2299,4697,9839,
 21409,50358,141235,232113,464230,928479,1857057,
 3714559,7430849,14869238,29778995,59739745,
 120175856,243137792,497430263,1039731033,
 2262860113]