This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A083940 #7 Jan 29 2024 07:03:39 %S A083940 0,1,6,43,51,389,416,477,504,551,4102,4191,4397,4485,4649,5100,5187, %T A083940 5393,5481,5645,5964,6051,6215,6489,47404,47700,48403,48697,49268, %U A083940 50833,51126,51828,52120,52691,53829,54120,54690,55690,59334,59627,60328 %N A083940 A014486-indices of symmetric binary trees. %C A083940 Fixed points of permutation A057163. %F A083940 a(0)=0, a(n)=A072764bi(n-1, A057163(n-1)). %Y A083940 a(n) = A080300(A083941(n)). Cf. A083938, A084108. %K A083940 nonn %O A083940 0,3 %A A083940 _Antti Karttunen_, May 13 2003