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A261031 as a simple table

na(n)
01
11
24
38
421
544
6103
7217
8477
9999
102116
114373
129055
1318464
1437576
1575725
16152047
17303158
18602085
191189242
202340065
214584027
228947865
2317399906
2433725509
2565153150
26125493914
27241011287
28461611911
29881806114
301680336592
313194346093
326058770147
3311466709780

[1,1,4,8,21,44,103,217,477,999,2116,4373,9055,
 18464,37576,75725,152047,303158,602085,1189242,
 2340065,4584027,8947865,17399906,33725509,
 65153150,125493914,241011287,461611911,881806114,
 1680336592,3194346093,6058770147,11466709780]