Indices of records in A246600.

Terms

a(0) =1a(1) =3a(2) =15a(3) =63a(4) =255a(5) =495a(6) =4095a(7) =96255a(8) =98175a(9) =130815a(10) =203775a(11) =1048575a(12) =5810175a(13) =6455295a(14) =16777215a(15) =67096575a(16) =88062975a(17) =389656575a(18) =553517055a(19) =850917375a(20) =1157349375a(21) =9141354495a(22) =12826279935a(23) =22828220415a(24) =26818379775a(25) =31684427775a(26) =68719476735a(27) =242870910975