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A278574 as a simple table

na(n)
15
231
38123
445439
5156157
6480209
72181737
86012899
913626257
1060487759
11217795247
12240485257
13995151679
144002927023
157186211917
1610514388763
1718553663237
1834434090797
19196122821897

[5,31,8123,45439,156157,480209,2181737,6012899,
 13626257,60487759,217795247,240485257,995151679,
 4002927023,7186211917,10514388763,18553663237,
 34434090797,196122821897]