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A289975 as a simple table

na(n)
00
11
21
34
47
518
637
785
8183
9407
10888
111956
124284
139409
1420630
1545270
1699289
17217819
18477776
191048053
202298912
215042783
2211061455
2324263687
2453223023
25116746272
26256086074
27561731936
281232174181
292702807740
305928681960
3113004724921
3228526216361

[0,1,1,4,7,18,37,85,183,407,888,1956,4284,9409,
 20630,45270,99289,217819,477776,1048053,2298912,
 5042783,11061455,24263687,53223023,116746272,
 256086074,561731936,1232174181,2702807740,
 5928681960,13004724921,28526216361]