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A259803 as a simple table

na(n)
11
21
32
44
59
618
741
889
9207
10467
111101
122552
136092
1414377
1534678
1682959
17201800
18487904
191195213
202914427
217181988
2217635162
2343679583
24107879951
25268378064
26666121087

[1,1,2,4,9,18,41,89,207,467,1101,2552,6092,14377,
 34678,82959,201800,487904,1195213,2914427,7181988,
 17635162,43679583,107879951,268378064,666121087]