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 A083930 #7 Jan 29 2024 07:01:58 %S A083930 0,7,49,57,439,452,515,541,585,4612,4631,4757,4795,4865,5455,5468, %T A083930 5744,5795,5865,6268,6294,6433,6688,53200,53226,53448,53500,53604, %U A083930 54935,54954,55430,55501,55605,56356,56394,56601,57003,63294,63313,63439 %N A083930 Map from binary trees of size n to the set of corresponding trivalent plane trees (tpt) represented as size 2n+1 general trees. %F A083930 a(n) = A057548(A057123(n)). %Y A083930 Inverse function: A083929. Positions of A083936 in A014486. %K A083930 nonn %O A083930 0,2 %A A083930 _Antti Karttunen_, May 13 2003