Earliest monotonic sequence fixed (apart from signs) under reversion.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =10a(5) =12a(6) =18a(7) =40a(8) =44a(9) =45a(10) =1850a(11) =11604a(12) =11616a(13) =11617a(14) =2132568a(15) =17001726a(16) =17001743a(17) =17001744a(18) =6660587898a(19) =64431061179a(20) =64431061180a(21) =64431061181