A014486-indices of symmetric binary trees.

Terms

a(0) =0a(1) =1a(2) =6a(3) =43a(4) =51a(5) =389a(6) =416a(7) =477a(8) =504a(9) =551a(10) =4102a(11) =4191a(12) =4397a(13) =4485a(14) =4649a(15) =5100a(16) =5187a(17) =5393a(18) =5481a(19) =5645a(20) =5964a(21) =6051a(22) =6215a(23) =6489a(24) =47404a(25) =47700a(26) =48403a(27) =48697a(28) =49268a(29) =50833