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A108305 as a simple table

na(n)
01
11
22
35
415
552
6203
7877
84139
921119
10115495
11671969
124132936
1326723063
14180775027
151274056792
169320514343
1770548979894
18550945607475
194427978077331
2036544023687590

[1,1,2,5,15,52,203,877,4139,21119,115495,671969,
 4132936,26723063,180775027,1274056792,9320514343,
 70548979894,550945607475,4427978077331,
 36544023687590]