Positions of records in A249442.

Terms

a(0) =0a(1) =4a(2) =6a(3) =13a(4) =15a(5) =43a(6) =47a(7) =239a(8) =7199a(9) =16559a(10) =21599a(11) =33119a(12) =45359a(13) =60479a(14) =90719a(15) =1179359