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A001683 as a simple table

na(n)
21
31
41
51
64
76
819
949
10150
11442
121424
134522
1414924
1549536
16167367
17570285
181965058
196823410
2023884366
2184155478
22298377508
231063750740
243811803164
2513722384546
2649611801980
27180072089896
28655977266884
292397708652276
308791599732140
3132330394085528

[1,1,1,1,4,6,19,49,150,442,1424,4522,14924,49536,
 167367,570285,1965058,6823410,23884366,84155478,
 298377508,1063750740,3811803164,13722384546,
 49611801980,180072089896,655977266884,
 2397708652276,8791599732140,32330394085528]