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 A090827 #6 Mar 31 2012 14:02:18 %S A090827 1,1,2,5,13,34,91,245,659,1786,4846,13182,35962,98418,270121,743533, %T A090827 2052073,5678238,15750382,43793198,122042214 %N A090827 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A089869/A089870. %C A090827 The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes. %H A090827 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A090827 nonn %O A090827 0,3 %A A090827 _Antti Karttunen_, Dec 20 2003