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 A217299 #16 Jun 26 2017 16:20:05 %S A217299 1,1,2,1,4,6,4,1,32,44,60,70,56,28,8,1,2720,4288,6312,9004,11992, %T A217299 14372,15400,14630,11968,8104,4376,1820,560,120,16,1,31327104, %U A217299 50882720,80963520,125489856,188637520,273984664,383305008,515461260,665277632,822361736 %N A217299 Number of height minimal AVL trees with n (leaf-) nodes. %H A217299 Alois P. Heinz, <a href="/A217299/b217299.txt">Table of n, a(n) for n = 1..1024</a> %H A217299 Wikipedia, <a href="https://en.wikipedia.org/wiki/AVL_tree">AVL tree</a> %H A217299 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %F A217299 a(n) = A143897(A029837(n),n) = A217298(A029837(n),n). %Y A217299 Cf. A217300. %K A217299 nonn,look %O A217299 1,3 %A A217299 _Alois P. Heinz_, Mar 17 2013