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 A067647 #3 Mar 30 2012 16:49:18 %S A067647 0,2,4,18,108,748,5648,45234,378300,3271204,29049824,263656356, %T A067647 2436827328,22871937208,217536523260,2092958991474,20341256951692, %U A067647 199471121367508,1971730006936240,19630246152650228 %N A067647 Number of knot diagrams of type 1PI with n crossings and two outgoing strings. %H A067647 J. L. Jacobsen and P. Zinn-Justin, <a href="http://arXiv.org/abs/math-ph/0102015">A Transfer Matrix approach to the Enumeration of Knots</a> %Y A067647 Cf. A054993, A067648. %K A067647 nonn %O A067647 0,2 %A A067647 _N. J. A. Sloane_, Feb 05 2002 %E A067647 Reference gives two further terms.