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A047775 as a simple table

na(n)
10
20
30
40
52
65
711
825
966
10131
11349
12708
131911
143856
1510604
1621597
1759961
18123266
19345060
20715198
212015416
224206926
2311919257
2425032840
2571246129
26150413234
27429750208
28911379241
292612614298
305562367173
3115991792731
3234164355260

[0,0,0,0,2,5,11,25,66,131,349,708,1911,3856,10604,
 21597,59961,123266,345060,715198,2015416,4206926,
 11919257,25032840,71246129,150413234,429750208,
 911379241,2612614298,5562367173,15991792731,
 34164355260]