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A223940 as a simple table

na(n)
01
12
24
38
416
531
661
7117
8228
9436
10845
111615
123120
135965
1411501
1522001
1642365
1781091
18156010
19298777
20574450
211100620
222115150
234053959
247788126
2514931102
2628676899
2754990202
28105594073
29202519004
30388825095
31745825185
321431776536
332746639052

[1,2,4,8,16,31,61,117,228,436,845,1615,3120,5965,
 11501,22001,42365,81091,156010,298777,574450,
 1100620,2115150,4053959,7788126,14931102,28676899,
 54990202,105594073,202519004,388825095,745825185,
 1431776536,2746639052]