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A267444 as a simple table

na(n)
01
12
25
310
421
543
687
7174
8349
9699
101399
112799
125599
1311199
1422399
1544798
1689597
17179195
18358391
19716783
201433567
212867135
225734271
2311468543
2422937087
2545874175
2691748351
27183496703
28366993407
29733986815
301467973631
312935947262
325871894525
3311743789051

[1,2,5,10,21,43,87,174,349,699,1399,2799,5599,
 11199,22399,44798,89597,179195,358391,716783,
 1433567,2867135,5734271,11468543,22937087,
 45874175,91748351,183496703,366993407,733986815,
 1467973631,2935947262,5871894525,11743789051]