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 A194092 #8 Mar 31 2012 10:22:49 %S A194092 1,1,0,1,0,1,0,2,1,5,2,17,11,65,54,299,333,1508,2041,8215,12971 %N A194092 The number of biconnected squaregraphs with n vertices. %D A194092 See A194088 %H A194092 Don Knuth, <a href="http://www-cs-faculty.stanford.edu/~knuth/programs/squaregraph.w">squaregraph.w</a> (CWEB program). %e A194092 For n=11 the a(11)=2 solutions are the P pentomino and the 5-cogwheel. %e A194092 The cases n=1 and n=2 are somewhat controversial, depending on whether the graphs K_1 and K_2 are considered to be "biconnected". %o A194092 (CWEB) (see Knuth link). %Y A194092 Cf. A194088, A194089, A194090, A194091, A194093. %K A194092 nonn,hard,more %O A194092 1,8 %A A194092 _Don Knuth_, Aug 15 2011