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A047015 as a simple table

na(n)
31
41
53
615
776
8339
91420
105839
1123688
1295161
13380150
141513029
156006246
1623801014
1794204653
18372561353
191472622468
205818884732
2122988198286
2290809767935
23358720596210
241417101527194
255598669041853
2622121838476973

[1,1,3,15,76,339,1420,5839,23688,95161,380150,
 1513029,6006246,23801014,94204653,372561353,
 1472622468,5818884732,22988198286,90809767935,
 358720596210,1417101527194,5598669041853,
 22121838476973]