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 A057122 #3 May 01 2014 02:48:24 %S A057122 0,10,180,210,2920,2980,3380,3490,3730,46800,46920,47720,47940,48420, %T A057122 54120,54180,55860,56130,56610,59700,59810,60690,62610,748960,749200, %U A057122 750800,751240,752200,763600,763720,767080,767620,768580,774760,774980 %N A057122 The binary encoding (as a rooted planar tree) of each rooted planar binary tree. See A057123 for illustration. %C A057122 bintree_depth_first2tree given in A057119. %p A057122 map(bintree_depth_first2tree, A014486); %Y A057122 Cf. A057119, A057123, A057124. Subset of A057517. %K A057122 nonn %O A057122 0,2 %A A057122 _Antti Karttunen_, Aug 11 2000