a(n) is the unique k such that A357961(k) = 2^n.

Terms

a(0) =1a(1) =2a(2) =9a(3) =8a(4) =17a(5) =34a(6) =64a(7) =129a(8) =252a(9) =515a(10) =1026a(11) =2044a(12) =4091a(13) =8184a(14) =16375a(15) =32758a(16) =65525a(17) =131060a(18) =262131a(19) =524279a(20) =1048566a(21) =2097167a(22) =4194322a(23) =8388590a(24) =16777203a(25) =33554450a(26) =67108877a(27) =134217712a(28) =268435473a(29) =536870929