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A018915 as a simple table

na(n)
02
16
217
348
4135
5379
61064
72987
88385
923538
1066074
11185477
12520654
131461532
144102678
1511516659
1632328502
1790749586
18254743859
19715093440
202007344278
215634831512
2215817578736
2344401646533
24124640202381
25349878467638
26982146528794
272756991050447

[2,6,17,48,135,379,1064,2987,8385,23538,66074,
 185477,520654,1461532,4102678,11516659,32328502,
 90749586,254743859,715093440,2007344278,
 5634831512,15817578736,44401646533,124640202381,
 349878467638,982146528794,2756991050447]