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 A036252 #11 Jul 08 2025 21:43:26 %S A036252 1,3,6,6,16,39,114,335,1081,3574,12408,44076,160915,598244,2263400, %T A036252 8681464,33713947,132305267,524095596,2093208435,8422013745, %U A036252 34110403728,138979989162,569339728312,2343898451275,9693334574919 %N A036252 Number of trees with 3-colored leaves. %H A036252 <a href="/index/Tra#trees">Index entries for sequences related to trees</a> %F A036252 G.f.: A(x) = B(x)+B(x)^2/2+B(x^2)/2-B(x)*(B(x)-2*x), where B(x) = g.f. for A029857. %K A036252 nonn %O A036252 0,2 %A A036252 _Christian G. Bower_, Nov 15 1998