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 A089418 #5 Mar 31 2012 14:02:17 %S A089418 1,1,0,1,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A089418 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A082333/A082334. %C A089418 The number of n-node binary trees fixed by the corresponding automorphism(s). %H A089418 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089418 nonn %O A089418 0,5 %A A089418 _Antti Karttunen_, Nov 29 2003