Indices of records in A347409.

Terms

a(0) =1a(1) =2a(2) =3a(3) =15a(4) =21a(5) =75a(6) =151a(7) =1365a(8) =5461a(9) =7407a(10) =14563a(11) =87381a(12) =184111a(13) =932067a(14) =5592405a(15) =13256071a(16) =26512143a(17) =357913941a(18) =1431655765a(19) =3817748707a(20) =22906492245a(21) =91625968981a(22) =244335917283