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A001643 as a simple table

na(n)
11
23
34
411
521
642
771
8131
9238
10443
11815
121502
132757
145071
159324
1617155
1731553
1858038
19106743
20196331
21361106
22664183
231221623
242246918
254132721
267601259
2713980892
2825714875
2947297029
3086992802
31160004703
32294294531
33541292030
34995591267
351831177831

[1,3,4,11,21,42,71,131,238,443,815,1502,2757,5071,
 9324,17155,31553,58038,106743,196331,361106,
 664183,1221623,2246918,4132721,7601259,13980892,
 25714875,47297029,86992802,160004703,294294531,
 541292030,995591267,1831177831]