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 A089877 #5 Mar 31 2012 14:02:17 %S A089877 1,1,0,0,0,5,0,0,0,5,0,10,0,5,0,10,0,45,0,10,0 %N A089877 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A071667/A071668. %C A089877 The number of n-node binary trees fixed by the corresponding automorphism(s). %H A089877 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %K A089877 nonn %O A089877 0,6 %A A089877 _Antti Karttunen_, Nov 29 2003