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 A052326 #17 Dec 19 2015 14:15:13 %S A052326 1,1,0,0,0,0,0,0,0,0,0,1,2,6,11,25,49,105,211,444,903,1880,3865,8042, %T A052326 16658,34764,72484,151856,318418,669934,1411637,2982407,6311760, %U A052326 13387127,28442458,60543586,129084965,275683061,589660911,1263128375 %N A052326 Number of asymmetric trees with a forbidden limb of length 3. %C A052326 A tree with a forbidden limb of length k is a tree where the path from any leaf inward hits a branching node or another leaf within k steps. %H A052326 Vaclav Kotesovec, <a href="/A052326/b052326.txt">Table of n, a(n) for n = 0..1000</a> %H A052326 <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a> %F A052326 G.f.: 1 + B(x) + x^4 + x^5 + x^6 - (B(x^2) + B(x)^2)/2 where B(x) is g.f. of A052325. %F A052326 a(n) ~ c * d^n / n^(5/2), where d = 2.2767145838879762709809174486..., c = 0.15900430026983804503695298... . - _Vaclav Kotesovec_, Aug 25 2014 %Y A052326 Cf. A002955, A002988-A002992, A052318-A052329. %K A052326 nonn %O A052326 0,13 %A A052326 _Christian G. Bower_, Dec 15 1999 %E A052326 More terms, formula and comments from _Christian G. Bower_, Dec 15 1999 %E A052326 Typo in cross-reference corrected by _Vaclav Kotesovec_, Aug 25 2014