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 A158921 #2 Mar 30 2012 17:25:51 %S A158921 1,2,3,8,17,31,51,112,234,464,931,1855,3687,4877 %N A158921 Positions of hexanacci numbers in the EKG sequence. %e A158921 The hexanacci number 7617 is located at position 4877 in the EKG sequence. %Y A158921 A001592, A064413, A140897, A144080 %K A158921 nonn %O A158921 1,2 %A A158921 _Parthasarathy Nambi_, Mar 30 2009