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 A048828 #10 Dec 19 2015 13:16:47 %S A048828 1,0,0,0,0,1,4,66,65328,2146402440 %N A048828 Number of identity (asymmetric) trees of width n. %H A048828 <a href="/index/Tra#trees">Index entries for sequences related to trees</a> %F A048828 a(2n) = 2^(c(n-2))*(2^b(n-1) - b(n-1)-1), a(2n+1) = b(n)*(b(n)-1)/2, b: A038081. c: A014221. %K A048828 nonn %O A048828 0,7 %A A048828 _Christian G. Bower_, Jun 15 1999